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Ch. 21 - Electricity

Ch. 21 - Electricity. IV. Measuring Electricity (p.614-618) Electrical Power Electrical Energy. A. Electrical Power. Electrical Power rate at which electrical energy is converted to another form of energy. P: power ( W) I: current (A) V: potential difference (V). P = I × V.

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Ch. 21 - Electricity

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  1. Ch. 21 - Electricity IV. Measuring Electricity (p.614-618) Electrical Power Electrical Energy

  2. A. Electrical Power • Electrical Power • rate at which electrical energy is converted to another form of energy P: power (W) I: current (A) V: potential difference (V) P = I × V

  3. A. Electrical Power • A calculator has a 0.01-A current flowing through it. It operates with a potential difference of 9 V. How much power does it use? GIVEN: I = 0.01 A V = 9 V P = ? WORK: P = I · V P = (0.01 A) (9 V) P = 0.09 W P V I

  4. B. Electrical Energy • Electrical Energy • energy use of an appliance depends on power required and time used E: energy (kWh) P: power (kW) t: time (h) E = P × t

  5. B. Electrical Energy • A refrigerator is a major user of electrical power. If it uses 700 W and runs 10 hours each day, how much energy (in kWh) is used in one day? GIVEN: P = 700 W = 0.7 kW t = 10 h E = ? WORK: E = P · t E = (0.7 kW) (10 h) E = 7 kWh E t P

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