Question

A device that is used to break or make an electric circuit is called _ _ _ _ _ _ _ _.
A. potentiometer
B. switch
C. breaker
D. fuse

Answer 1

Hint: We can solve this problem with the concept of switching from the current electricity. A circuit has many components to be a complete circuit. It should have an ammeter, a voltmeter, resistance and switch. An ammeter and the voltmeter are series and parallel with the circuit respectively.

Complete answer:
The current, voltage and the resistance relationship in the electrical circuit can be described by Ohm's law which is represented as follows: where is voltage, current and resistance. When the current flows through the circuit, the temperature of wire increases which makes a great trouble. Due to the increase in the temperature, the circuit may be destroyed. Switch is an electrical device that can disconnect or connect the conducting path in a circuit, it can interrupt the electrical current or divert it from one path to another.

Hence switch is the device which is used to break or make an electrical circuit. When the switch is ‘ON’ position, then the circuit is completely called the open circuit and allows the current to flow through the circuit. When the switch is ‘OFF’ position, the circuit is incomplete known as a closed circuit and it does not allow the current to flow through the circuit.

So, the correct answer is “Option B”.

Note:
There are two types of switch: ideal and practical. Ideal switches have zero voltage drop or zero resistance in the ON state so it offers no obstruction in the circuit and in the OFF state, ideal switches have infinite resistance. Power loss across the switch should be zero in its both the OFF and ON state.