Physics Exam > Physics Videos > Basic Physics for IIT JAM > Electromotive Force
Electromotive Force Video Lecture | Basic Physics for IIT JAM
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FAQs on Electromotive Force Video Lecture - Basic Physics for IIT JAM
| 1. What is electromotive force (EMF)? |  |
Ans. Electromotive force (EMF) is the voltage or electrical potential difference produced by a source, such as a battery or generator, that drives electric current in a circuit. It is not an actual force, but rather a measure of the energy per unit charge supplied by the source.
| 2. How is electromotive force different from voltage? | |
Ans. Electromotive force (EMF) and voltage are often used interchangeably, but they have slightly different meanings. While voltage refers to the potential difference between two points in a circuit, EMF specifically refers to the potential difference produced by a source. In other words, EMF is the driving force that causes current to flow, whereas voltage is the measure of the potential difference at any given point in the circuit.
| 3. What are some common sources of electromotive force? | |
Ans. Some common sources of electromotive force include batteries, generators, and solar cells. Batteries convert chemical energy into electrical energy, while generators and solar cells convert mechanical or light energy into electrical energy. These sources provide the necessary voltage or EMF to power electrical devices and circuits.
| 4. How is electromotive force related to the concept of work done? | |
Ans. Electromotive force (EMF) is related to the concept of work done through the equation: EMF = work done / charge. This equation shows that EMF is the work done per unit charge in moving a charge around a complete circuit. It represents the energy supplied by the source to overcome the resistance and maintain the flow of current in the circuit.
| 5. Can electromotive force be measured directly? | |
Ans. No, electromotive force (EMF) cannot be measured directly as it is a potential difference produced by a source. However, it can be measured indirectly by connecting a voltmeter across the terminals of the source. The voltmeter measures the voltage or potential difference, which is equivalent to the EMF of the source.
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