Question

a. Name an electrical instrument that that measures potential difference
between two points in a circuit.
b. Define the unit of potential difference in terms of SI unit of charge and
work. Draw the circuit symbols for a (i) variable resistor (ii) a closed
plug key
c. Two electric circuits I and II are shown below.

i. Which of the two circuits has more resistance?
ii. Through which circuit more current passes?
iii. In which circuit, the potential differences across each resistor is equal ?​​

Answer 1

Answer:

a) A voltmeter is an instrument used for measuring electrical potential difference between two points in an electric circuit. An ammeter is a measuring device used to measure the electric current in a circuit.

b) Units of potential difference are joules per coulomb, given the name volt (V) after Alessandro Volta. The familiar term voltage is the common name for electric potential difference. Keep in mind that whenever a voltage is quoted, it is understood to be the potential difference between two points.

C)