A lamp with a filament resistance of 230 ohms is switched on at peak hours when the voltage is only 210 volts. a. How much current is passing through the lamp? b. Later in the night, the voltage rises to 220 volts. How many amperes in the lamp now using? c. What filament resistance should a lamp have if the voltage was raised to 230 volts but the same current in b was used?

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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.