Electrical power is defined as the rate at which electrical energy is converted to another form of energy. Power is calculated as the product of current and voltage, and is measured in watts or kilowatts. Electrical energy usage is calculated as power multiplied by time, with energy measured in kilowatt-hours. Appliances like refrigerators that run continuously use more energy over time than devices with intermittent usage.

1. Electrical Power and Energy

2. Electrical Power- the rate at which electrical energy is converted to another form of energy. -the rate of appliances using energy varies. -refrigerators use more energy because they run all the time.

3. Calculating Power Variable Ending Units Power (P) Watts (kilowatts) Current (I) amps Voltage (V) volts 1000 watts = 1 kilowatt

4. P = I x V I = P / V V = P / I P I V x . . . .

5. Calculating Energy Usage Variable Ending Units Energy (E) kilowatt-hour (kWh) Power (P) kilowatt (kW) Time (t) hours (h)

6. E = P x t P = E / t t = E / P E P t x . . . .