Question

A conduction tester is made by a bulb. But it does not detect weak currents. How can we make another tester which detect weak current?

Answer 1

Answer:

LED BULB

Explanation:

LED BULB CAN DETECT LESS/ WEAK FLOW OF CURRENT.

USING IT IN THE TESTER WILL SOLVE THE PROBLEM...

When a weak current is passed through a circuit with an electric bulb, the bulb does not glow as the current is not sufficient enough to do so. But, when the electric bulb is replaced by a LED bulb, it glows because an LED bulb requires only a small amount of current to glow. In the similar way, when a magnetic compass is connected in the same circuit, the needle shows slight deflection which indicates the presence of current. More the current, more the deflection. The needle comes to zero only when the current is zero.

Hence, a LED bulb or a magnetic compass indicates the presence of a weak current in the circuit.