Umair Gaines
Electric potential difference, also known as voltage, electric pressure, or electric tension, is the difference in electric potential between two points. It is the change in potential energy of a charge moved from one point to another, divided by the charge. The electric potential difference is measured in volts (V), with 1 volt being equal to 1 joule per coulomb. This quantity can be measured using a voltmeter, which is connected between the two points in the system. The electric potential difference is a fundamental concept in understanding electrical circuits and the behaviour of charged particles in electric fields.
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What You'll Learn
Electric potential difference and voltage
Electric potential difference, also known as voltage, refers to the difference in electric potential between two points. It is a fundamental concept in understanding electrical circuits and is often compared to pressure difference in a water circuit. Voltage is measured in volts (V) in the International System of Units (SI).
In a static electric field, voltage corresponds to the work needed per unit of charge to move a positive test charge from one point to another. This can be influenced by factors such as the build-up of electric charge or the presence of an electromotive force. A voltmeter can be used to measure the voltage between two points, providing valuable insights into the electrical system.
The relationship between voltage and energy is important to understand. While they are distinct concepts, voltage plays a role in converting a voltage difference into an electric current, similar to how gravity converts potential energy into kinetic energy. As a battery discharges, its terminal voltage drops, impacting the energy supplied.
The electric potential difference between points can be calculated using the formula \(V_B - V_A\), representing the change in potential energy of a charge \(q\) moved from point A to point B, divided by the charge. This value is expressed in joules per coulomb or volts. It's important to note that the choice of reference point for zero volts is arbitrary, similar to choosing a reference point for gravitational potential energy.
Visual aids and analogies, such as the hydraulic analogy, can be extremely useful in grasping these electrical concepts. For instance, in a water circuit, the potential difference between two points corresponds to the pressure difference, influencing the flow of water just as voltage affects electric current. Understanding voltage and electric potential difference is crucial for comprehending the behaviour of electrical systems and designing efficient circuits.
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How to measure voltage
Voltage, also known as electrical potential difference, electric pressure, or electric tension, is the difference in electric potential between two points. A voltmeter can be used to measure the voltage between two points in a system. When using a voltmeter to measure voltage, one electrical lead of the voltmeter must be connected to the first point and the other to the second point. The voltmeter measures the negative of the difference in the electrochemical potential of electrons (Fermi level) divided by the electron charge, commonly referred to as the voltage difference.
To measure voltage, a digital multimeter is considered the easiest device. The steps to measure voltage using a multimeter are as follows:
- Set the multimeter to measure voltage and not amps or ohms.
- Choose the range of the voltage you plan to test. Most digital multimeters are autoranging, but you may have to adjust the range yourself. Set the range to one level above the voltage you plan to measure.
- Plug the red lead into the slot marked with a V on the multimeter, and plug the black lead into the slot marked COM.
- Select the mode for DC or AC voltage with the centre selection dial. The symbol for DC is generally indicated by a straight line and three dots beneath it, while AC is indicated by a wavy line.
- Test the multimeter on a battery before anything else. Place the red lead on the positive terminal and the black lead on the negative terminal, and choose the higher range of the battery's regular voltage with the centre knob.
- To test the voltage on other electrical components, identify the positive and negative terminals in the manufacturer's guide to attach the probes to the correct place.
- Read the display to find the voltage measurement, and make adjustments if needed.
It is important to note that voltmeters are prone to damage if you measure DC with the AC setting and vice versa.
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The relationship between voltage and energy
Voltage, also known as electrical potential difference, electric pressure, or electric tension, is the difference in electric potential between two points. The electric potential is defined as electric potential energy per unit of electric charge. In other words, it is the amount of work needed to move a test charge from a reference point to a specific point in a static electric field.
- Voltage and energy are related but distinct concepts. While the voltages of batteries may be identical, the energy supplied by each can vary significantly. For example, a car battery has a larger engine to start than a motorcycle, resulting in different energy outputs at the same voltage.
- The electric potential difference between two points is defined as the change in potential energy of a charge moved between those points, divided by the charge. The unit of potential difference is joules per coulomb, also known as a volt (V).
- The relationship between voltage and energy can be observed when an electron is accelerated through a potential difference. For instance, an electron accelerated through a potential difference of 1 volt gains 1 electron-volt (eV) of energy. Similarly, an electron accelerated through 50 volts gains 50 eV of energy, and so on.
- The concept of voltage can be understood using the hydraulic analogy. In a hydraulic system, the work done to move water is equal to the pressure drop multiplied by the volume of water moved. Similarly, in an electrical circuit, the work done to move electrons is equal to the electrical pressure difference (voltage) multiplied by the quantity of electrical charges moved.
- The voltage across an electrical device, such as a resistor, can be understood as the difference in potential energy between two terminals with respect to a common reference point. This voltage drop is the difference between the two readings.
- Voltage is not an absolute quantity; it is relative to a reference value. Voltage alone does not indicate the energy of a charged particle, just as height alone does not indicate the gravitational potential energy of an object.
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The impact of resistance on voltage
Voltage, also referred to as electric potential difference, electric pressure, or electric tension, is the difference in electric potential between two points. It is measured in volts (V) and can be measured using a voltmeter.
The relationship between voltage, current, and resistance is important. Ohm's law states that voltage is equal to the product of current and resistance (V = IR). As resistance increases, the current decreases, assuming a constant voltage. This relationship demonstrates that voltage and current are inversely proportional to each other when resistance is constant.
In a circuit, adding an extra resistor increases the overall resistance, leading to a decrease in current. However, the voltage remains constant as the increase in resistance is offset by a corresponding decrease in current. This phenomenon is known as the voltage drop.
Fixed resistors are used in circuits to control the size of the current and voltage, ensuring that the correct voltage is applied to a component, such as a bulb. Without a resistor, the voltage could surge, causing damage to the component. Variable resistors can also be used to adjust the current and voltage, such as in a dimmer switch for a light bulb.
In summary, resistance plays a critical role in influencing voltage within an electrical circuit. The relationship between voltage, current, and resistance is described by Ohm's law, and changes in resistance can impact the overall voltage and current in a circuit.
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Electric potential and electric field
Electric potential, also known as electric field potential or electrostatic potential, refers to the amount of work required to move a small electric charge from a reference point to a specific point in a static electric field. It is defined as the electric potential energy per unit of electric charge. In other words, it represents the energy that a charged particle possesses in a specific location within an electric field. The reference point for electric potential is typically Earth or a point at infinity, and its value is assumed to be zero. By dividing the charge on a particle, we obtain a property of the electric field itself, which is the electric potential.
The electric potential difference, often referred to as voltage, is the change in electric potential between two points. It corresponds to the work needed per unit of charge to move a positive test charge from one point to another. Voltage can be measured using a voltmeter, and the derived unit for voltage in the International System of Units (SI) is the volt (V). The volt is named after Alessandro Volta, and 1 volt is equal to 1 joule per coulomb (J/C). Voltage is related to energy, but they are distinct concepts. For example, a car battery and a motorcycle battery may have the same voltage, but the energy supplied by each is different due to the varying engine sizes.
The electric field is a vector quantity that describes the force exerted on a charged object within the field. The direction and magnitude of the force depend on the charge of the object. If the object has a positive charge, the force will follow the direction of the electric field vector at that location. Conversely, if the charge is negative, the force will act in the opposite direction. The magnitude of the force is determined by multiplying the quantity of the charge by the magnitude of the electric field vector.
The relationship between electric potential and electric field can be understood through the concept of potential energy. The electric potential energy of a charged object in an electric field depends on its position within the field. By moving a charged particle from one point to another within the electric field, work is done, and the potential energy of the particle changes. This change in potential energy between two points is what defines the electric potential difference or voltage.
In summary, electric potential represents the energy per unit charge at a specific point in an electric field, while electric potential difference or voltage refers to the change in electric potential between two points. Electric field, on the other hand, describes the force exerted on a charged object within the field, with the force's direction and magnitude depending on the object's charge. Understanding these concepts is crucial for comprehending the behaviour of electric charges, circuits, and various electrical phenomena.
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Frequently asked questions
Electric potential difference, also known as voltage, is the difference in electric potential energy per unit charge between two points.
The voltage provided by a sufficiently charged automobile battery can push a large current through the windings of an automobile's starter motor.
The electric potential difference between points A and B, VB - VA, is defined as the change in potential energy of a charge q moved from point A to point B, divided by the charge.
