Question

which one of the following can be used to detect an electric current passing through a circuit
a) LED
b) Compass
c) Electric bulb
d) All of these
e) None of these

Answer 1

The correct option is d: All of these

Explanation:

LED can be used detect an small electric current passing through a circuit .

Compass can all be used because current carrying wire produces magnetism. So compass deflect.

Electric bulb can also be used to detect an electric current passing through a circuit

Answer 2

Answer is - d. All of these

Electric bulb

When electric current flows through a bulb the filament of the bulb start glowing. This is because the filament of the bulb gets heated due to the heating effect of the current.

The electric current flowing through liquids can be detected by using:

1. LED - It is a semiconductor device which glows even when a week current flows through it.

2. Compass - If an electric current flows through the liquid the magnetic needle of the compass shows deflection.