Electrical Power Physics Example 1

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Example 1

easy
A device draws 3 A3 \text{ A} from a 120 V120 \text{ V} outlet. What is the electrical power consumed?

Solution

  1. 1
    Use the electrical power formula: P=VIP = VI.
  2. 2
    Substitute the given values: P=120×3P = 120 \times 3.
  3. 3
    P=360 WP = 360 \text{ W}

Answer

P=360 WP = 360 \text{ W}
Electrical power is the rate at which electrical energy is consumed. It can be calculated as voltage times current.

About Electrical Power

The rate at which electrical energy is converted to other forms of energy (heat, light, motion). Measured in watts (W).

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More Electrical Power Examples

Example 2 medium

A [formula] light bulb operates at [formula]. What is its resistance and the current it draws?

Example 3 medium

An electric kettle rated at [formula] operates for [formula]. How much energy does it use in kJ?

Example 4 medium

A kettle is rated at [formula] and operates on a [formula] supply. (a) What current does it draw? (b

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