Ohms Law | MCQs

Explanation

The power (P) is given by:

P = VI

Given P = 100 W and V = 200 V, we can find the current (I):

100 = 200 × I

I = 100 / 200

= 0.5 A

Explanation

The formula for resistance is R = V/I.

This formula is derived from Ohm's law,

which states that the electrical resistance of a circuit is the ratio between the voltage applied to the current flowing through it

Explanation

Ohm's law is not applicable to Semiconductors, as the relationship between voltage and current does not remain constant in these devices.

Semiconductors have a non-linear current-voltage characteristic, making Ohm's law inapplicable.

Explanation

Ohm's Law is valid only if the temperature of the conductor remains constant.

If the temperature changes, the resistance of the conductor may change, and Ohm's Law may not hold.

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.

Explanation

The magnitude of the current in metals being proportional to the potential difference across it, as long as the temperature of the conductor is kept constant, is known as Ohm's Law.

This law is expressed mathematically as V= I⋅R, where V is voltage, I is current, and R is resistance.

Explanation

The relationship between voltage and current in a purely resistive circuit is that voltage and current are in phase.