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Electrical Power and Energy When a battery sends a current through a resistor, as in Fig. the battery is furnishing energy to resistor. In effect, the battery lifts charge from the low potential at b to higher potential at a. the potential difference between these two points is simply the voltage of the battery. The work done by the battery in the process of lifting a charge q from b to a is, Let us next compute the power output of the battery as it drives a current rough the circuit. We have known at 8th grade that Power = W (P) t P=VI By using Ohm’s Law (V = IR) Prove that can express with P = IRI = I2 R P = watt (J/s) V = volt R = ohm W = Joule t = second Q =coulomb Factor that can influence the magnitude the power Voltage , Resistance, Current, Time, charge Power in electrical devices How to calculate Energy? R Voltage resource I o o • Electrical Energy’s signed by E •The unit (SI) is watt seconds E=Pt E= V.I.t E = I2Rt (Because V = IR) KWh meter, use to measure electrical Energy Electric Stealing CALCULATE ELECTRIC COST Cost = Energy x tariff rate = KWh x tariff rate (in Rupiah) Exercises 1. In a house , there are 5 lamps of 60 watt each, a TV of 70 watt. If those electric devises are Turned on for 4 hours every day, what is the cost that must be paid for 1 month (30 days) If price of 1 kWh = Rp 100.00 2. A TV turned on for 10 hours per day, is connected to a voltage of 220 V and needs current Of 3 A. If the price of 1 kWh = Rp 200.00, calculate the electricity cost that must be paid for 1 month ( 30 day)