On the technical sheet of a television, you can read the following information: 120 V, 225 W. a) What is the resistance of the television? b) What is the electrical current that powers the television? c) If it runs 4 hours a day for a week, how much energy does it use? d) If the KWh costs 7 ¢, how much will you pay per week?

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A: SOlution: Given that R = 240 Ohm V = 120 V

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A: V=Voltage=1.2 VR=Resistance=10  kΩ

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Resistivity

Resistivity is a characteristic property of the conductor’s material that measures the extent to which the material opposes the flow of current. It is denoted by the Greek letter “rho”. Electrical resistivity, also known as specific resistance, depends on the nature of the material of the conductor and is unaffected by its dimensions.