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Question
An electric iron is connected to the 230 V mains supply. A current of 8 A flows through the iron. How much energy is transferred to the heater each second?
An electric iron is connected to the 230 V mains supply. A current of 8 A flows through the iron. How much energy is transferred to the heater each second?
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Solution
The correct option is B 1840J
Answer is B.
Energy (power×time) is measured in Joules and by including time (t) in the power formulae, the energy dissipated by a component or circuit can be calculated.
Energy dissipated = Pt or VI×tasP=VI.
In this case, V = 230 V, I = 8 A and t = 1 second.
Therefore, the heat transferred P = 230 * 8 * 1 = 1840 Joules.
Hence, the energy is transferred to the heater each second is 1840 J.
Answer is B.
Energy (power×time) is measured in Joules and by including time (t) in the power formulae, the energy dissipated by a component or circuit can be calculated.
Energy dissipated = Pt or VI×tasP=VI.
In this case, V = 230 V, I = 8 A and t = 1 second.
Therefore, the heat transferred P = 230 * 8 * 1 = 1840 Joules.
Hence, the energy is transferred to the heater each second is 1840 J.
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