9 - Electromotive Force and Potential Difference

Multiple Choice

Electromotive force (EMF) is the energy per unit charge supplied by a source, such as a battery or generator, to move charges around a circuit. It is responsible for maintaining a potential difference across the circuit, which allows charges to flow and create an electric current.

• True

• False

Multiple Choice

If an electron does work of 20 J with a charge of 10 C in an electrical circuit, then what is the electromotive force (EMF) possessed by the circuit?

• 2 V

• 200 V

• 0.5 V

Open Ended

An electrical circuit has an EMF of 7.5 V. If a charge flows through it with a magnitude of 1.5 C, then how much work is done by this charge?

Multiple Choice

The unit of potential difference is volt.

• True

• False

Open Ended

If a charge of 5 coulombs flows through a lamp, performing work of 10 J, then what is the potential difference that occurs in the circuit?

How to read Voltmeter Analog