PHYSICS
JAMB 2021 - Question 7
Physics 2021 JAMB Past Questions - Question 7: An equipment which is 1,500W and resistance 375Ω will draw a current of
Choose the correct answers from the options given.
A:
B:
C:
D:
Correct Answer
D
Explanation
To calculate the current drawn by the equipment, you can use Ohm's law, which states that the current (I) flowing through a resistor is equal to the voltage (V) across the resistor divided by the resistance (R) of the resistor. The formula is:
\[ I = \frac{V}{R} \]
Given that the equipment has a power of 1,500W and a resistance of 375Ω, we can use the formula \( P = IV \) to find the voltage (V) across the equipment:
\[ V = \sqrt{P \times R} \]
\[ V = \sqrt{1500 \times 375} \]
\[ V = \sqrt{562500} \]
\[ V = 750 \, \text{volts} \]
Now, we can use Ohm's law to find the current (I):
\[ I = \frac{V}{R} \]
\[ I = \frac{750}{375} \]
\[ I = 2 \, \text{amperes} \]
Therefore, the equipment will draw a current of 2 amperes.
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