Question

If the circuit in the motorcycle runs off a standard 12 V battery, and one of the headlights is switched on, current flowing through the headlight is measured at 3.75 A. What is the power usage of the headlamp? Report the answer to two significant digits

Answer 1

Answer:

45 W

Explanation:

Power: This can be defined as the rate at which electrical energy is consumed in a circuit. The unit of power is Watt (W).

From the question,

The expression for power is given as,

P = VI.................. Equation 1

Where V = Voltage, I = current.

Given: V = 12 V, I = 3.75 A.

Substitute into equation 1.

P = 12(3.75)

P = 45 W.

Answer 2

Answer:

P = 45 Watt

Explanation:

The electrical power used by an electrical device or the electrical circuit is given by the following formulae:

P = VI

P = I²R

P = V²/R

where,

P = Electrical Power Consumed by the Device

V = The Voltage applied to the circuit or device

R = Resistance of device or circuit

I = Current passing through the device or circuit

We have the following data for our circuit:

V = 12 volts

I = 3.75 A

Therefore, it is clear from the data that we will use the first formula:

P = VI

P = (12 volts)(3.75 A)

P = 45 Watt