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BECE Science 2021 Paper

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Question : 39

Total: 40

The current flowing through a resistor of resistance 10 ohms is 2.5 A. What is the potential difference between the two

terminals of the resistor?

$4\ \text{V}$
$12.5\ \text{V}$
$25\ \text{V}$
$50\ \text{V}$

Solution:

Concept:

Ohm's law states that the potential difference across a resistor equals the product of the current through it and its resistance.

Explanation:

From the question, the resistance is

R = 10\ \Omega

and the current is

I = 2.5\ \mathrm{A}

.

Using Ohm's law:

V = IR

.

Substitute the given values into the formula:

V = 2.5\ \mathrm{A} \times 10\ \Omega = 25\ \mathrm{V}

.

Therefore, the potential difference measured across the two terminals of the resistor is

25

volts.

Answer:

25\ \mathrm{V}

, which is option C.

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