Question

If 5A current flows through an electric iron, it produces 50J heat in one second, the potential across the electric iron will be

• A. 10V
• B. 0.1V
• C. 225V
• D. 2.25V

Hint:

The potential (voltage) across an electric device can be calculated using the formula \( V = \dfrac{P}{I} \), where \( P \) is the power and \( I \) is the current.

Answer 1

The Correct Option is A

We use the formula for electrical power: \[ P = I^2 R, \] where \( P \) is power, \( I \) is current, and \( R \) is resistance. We also know the relationship between power, voltage, and current: \[ P = V \times I, \] where \( V \) is voltage.

Step 1: Calculate the voltage.
Given that \( P = 50 \, \text{J} \) and \( I = 5 \, \text{A} \), we can calculate the voltage: \[ V = \dfrac{P}{I} = \dfrac{50}{5} = 10 \, \text{V}. \]

Step 2: Conclusion.
Thus, the potential across the electric iron is 10V.

Final Answer: 10V.