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Question
A 100 Ω resistor is connected to a 220 V, 50 Hz ac supply.
- What is the rms value of current in the circuit?
- What is the net power consumed over a full cycle?
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Solution
Resistance of the resistor, R = 100 Ω
Supply voltage, V = 220 V
Frequency, v = 50 Hz
a. The r.m.s. value of the current in the circuit is given as:
`"I" = "V"/"R"`
= `220/100`
= 2.20 A
b. The net power consumed over a full cycle is given as:
P = VI
= 220 × 2.2
= 484 W
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