If the power is 72 watts and the current is 3 amps, what is the voltage of the circuit?

If the power is 72 watts and the current is 3 amps, what is the voltage of the circuit?

• A. 20 V
• B. 24 V
• C. 30 V
• D. 28 V

Answer: (B)

To determine the voltage of the circuit when the power is known, you can use the formula relating power (P), voltage (V), and current (I): \[ P = V \times I \] In this case, you have: - Power (P) = 72 watts - Current (I) = 3 amps To find the voltage (V), you can rearrange the formula: \[ V = \frac{P}{I} \] Substituting in the given values: \[ V = \frac{72 \text{ watts}}{3 \text{ amps}} \] Calculating this yields: \[ V = 24 \text{ volts} \] Thus, the voltage of the circuit is 24 volts, which corresponds to the given answer. Understanding this relationship is essential in electrical circuits, as it allows for the calculation of one fundamental quantity when the other two are known. The formula is derived from Ohm's law and is universally applicable across various electrical engineering scenarios.

To determine the voltage of the circuit when the power is known, you can use the formula relating power (P), voltage (V), and current (I):

[ P = V \times I ]

In this case, you have:

• Power (P) = 72 watts

• Current (I) = 3 amps

To find the voltage (V), you can rearrange the formula:

[ V = \frac{P}{I} ]

Substituting in the given values:

[ V = \frac{72 \text{ watts}}{3 \text{ amps}} ]

Calculating this yields:

[ V = 24 \text{ volts} ]

Thus, the voltage of the circuit is 24 volts, which corresponds to the given answer. Understanding this relationship is essential in electrical circuits, as it allows for the calculation of one fundamental quantity when the other two are known. The formula is derived from Ohm's law and is universally applicable across various electrical engineering scenarios.