Question

Calculate the instantaneous voltage for an AC supply of 220v and 20hz

Answer 1

Answer:

Resistance of the resistor, R = 100 Ω

Supply voltage, V = 220 V

Frequency, ν = 50 Hz

(a) The rms value of 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

Answer 2

The voltage varies continually, following the values of a complete 360 degree sine curve, maximum value of plus or minus (220 x root 2) volts, 50 times a second.

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