emf is measured ina)J.Cb)Jc)J/Cd)J/C/mCorrect answer is option 'C'. Can you explain this answer?

Question

emf is measured in&#8203;a)J.Cb)Jc)J/Cd)J/C/mCorrect answer is option 'C'. Can you explain this answer?

Answer

Electromotive force, abbreviated emf (denoted and measured in volts), is the electrical intensity or 'pressure' developed by a source of electrical energy such as a battery or generator. ... This potential difference can drive an electric current if an external circuit is attached to the terminals. It is commonly measured in units of volts, equivalent in the metre–kilogram–second system to one joule per coulomb of electric charge. In the electrostatic units of the centimetre–gram–second system, the unit of electromotive force is the statvolt, or one erg per electrostatic unit of charge.

Answer

In a device without internal resistance, if an electric charge Q passes through that device, and gains an energy W, the net emf for that device is the energy gained per unit charge, or W/Q. Like other measures of energy per charge, emf has SI units of volts equivalent to joules per coulomb (J/C)

Answer

Work done=q*v;v=potential,q=charge

Answer

EMF, or electromotive force, is a measure of the electrical energy that is supplied by a source, such as a battery or generator. It is typically measured in volts (V) and represents the potential difference between two points in an electrical circuit.

The correct answer to the question is option 'C', which states that EMF is measured in J/C. Let's break down this answer and understand it in detail:

Explanation:
1. EMF as a measure of energy: EMF is a measure of the energy per unit charge supplied by a source. It represents the work done in moving a unit positive charge from one point to another in a circuit.
2. Units of EMF: The SI unit of energy is the joule (J) and the SI unit of charge is the coulomb (C). Therefore, the unit of EMF is joules per coulomb (J/C), which represents the amount of energy provided by the source for each unit of charge that flows through the circuit.
3. Analogy with voltage: EMF can also be considered as the voltage across the terminals of a source when no current is flowing. Voltage is defined as the potential difference between two points in a circuit, and it is also measured in volts (V). Therefore, EMF is equivalent to voltage and both are measured in volts (V) or joules per coulomb (J/C).
4. Difference between EMF and potential difference: It is important to note that EMF is not the same as potential difference. Potential difference (also known as voltage) is the measure of the energy transfer per unit charge between two points in a circuit. On the other hand, EMF is the energy supplied by a source per unit charge. The potential difference across a component in a circuit can be less than the EMF if there is resistance or other factors affecting the flow of current.

To summarize, EMF is measured in joules per coulomb (J/C), which represents the amount of energy supplied by a source for each unit charge that flows through a circuit. It is equivalent to voltage and represents the potential difference between two points in a circuit when no current is flowing.

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