Electric Circuits | MCQs

Explanation

The product RC (Resistance × Capacitance) gives the time constant in an RC circuit.

Its unit is Ohm × Farad = seconds (s), which is the unit of time.

Explanation

When two resistances are connected in parallel, the net resistance (Rnet) is calculated using the formula:

1/Rnet = 1/R1 + 1/R2

where R1 and R2 are the individual resistances.

In this case, R1 = 6 Ω and R2 = 12 Ω, so:

1/Rnet = 1/6 + 1/12 = 1/4

Rnet = 4 Ω

Therefore, the net resistance of the two resistances connected in parallel is 4 Ω.

Explanation

A short circuit is a condition where the resistance of a circuit is zero, or very close to zero.

This occurs when there is a direct connection between two points in a circuit, bypassing any resistance or load.

As a result, the current flows freely, and the voltage across the circuit is zero.

Explanation

Ohm's Law states that the current (I) flowing through a conductor is directly proportional to the voltage (V) applied across it, and inversely proportional to the resistance (R) of the conductor.

Mathematically, this is expressed as: I = V/R Or, V = I × R

This means that as the voltage increases, the current increases, provided the resistance remains constant.