C13 Electrical System: Resistance

C13 Electrical System: Resistance

Using Ohm's law, how to calculate the resistance of a component?

Multiple Choice

A current of 2A is flowing in a circuit. More batteries are added to the circuit. Describe whether the current will be

• more than 2A.

• less than 2A.

• remained the same.

Fill in the Blanks

A current of 2A is flowing in a circuit. The resistance of the component is 2Ω. Calculate the voltage of the power source.

Explanation

• V = RI

• V = 2 x 2 = 4V

Fill in the Blanks

A cell contained a voltage of 25V and a current is flowing through the circuit. The resistance across a lightbulb is 2Ω. Calculate the value of the current flowing through the lightbulb.

Explanation

• V = RI

• 25 = 2 x I

• I = 25/2

• I = 12.5 A

Fill in the Blanks

A cell contained a voltage of 50V and a current of 2A is flowing through the light bulb in the circuit. Calculate the resistance of the lightbulb

Explanation

• V = RI

• 50 = R x 2

• R = 50/2 = 25 $\Omega$