Ohm's Law | MCQs

Explanation

The microscopic form of Ohm's law is:

J = σE

where J is the current density.

σ is the conductivity.

E is the electric field.

Explanation

Ohm's Law states that voltage (V) is equal to the product of current (I) and resistance (R):

V = I × R

This law helps calculate the third quantity when any two (voltage, current, resistance) are known.

Explanation

When two resistances of 2Ω each are connected in parallel:

1/R = 1/R1 + 1/R2

= 1/2 + 1/2

= 2/2

= 1

R = 1Ω

Explanation

Ohm's Law is V = IR,

where V = voltage,

I = current,

and R = resistance.

Explanation

Ohm's law states that in a closed circuit, current is proportional to the voltage and inversely proportional to the resistance.

This means that as voltage increases, current increases, and as resistance increases, current decreases.

Explanation

• The relationship between current and potential difference (voltage) across a resistor is governed by Ohm's Law, which states that: I = V/R
• where I is the current, V is the voltage, and R is the resistance.
• This relationship is linear, meaning that if the voltage is reversed (i.e., the connections across the resistor are reversed), the current will also be reversed, but the graph will still be a straight line.