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26/09/2021 6:21 pm
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How many 176 Ω resistors (in parallel) are required to carry 5 A on a 220 V line?
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26/09/2021 6:24 pm
Given: V = 220 volts, I = 5 A
Resistance of each resistor, R = 176 Ω
Number of resistors = n, We know that V = RpI
∴ V = \(\frac{R}{n}\)I [∵ \(\frac{1}{R_p}\) = n(\(\frac{1}{R}\))]
or n = \(\frac{RI}{V}\) = \(\frac{176 \times 5}{220}\)
= 4
Hence, 4 resistors are required.