A) 225 volt
B) 240 volt
C) 220 volt
D) 200 volts
Correct Answer: A
Solution :
Resistance of circuit is given by \[R=\frac{V}{i}=\frac{P/i}{i}=\frac{P}{{{i}^{2}}}\] ??.(1) (Here, P= 20 watt, i = 4 amp, potential difference = 220 V From equation (1) \[R=\frac{20}{{{4}^{2}}}=\frac{20}{16}=1.25\Omega \] The terminal potential difference \[V=E-iR\] Emf produced \[=V+iR=220+4\times 1.25\] \[=225volt\]You need to login to perform this action.
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