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18/07/2021 2:01 pm
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A resistor has a resistance of 176 ohms. How many of these resistors should be connected in parallel so that their combination draws a current of 5 amperes from a 220 volt supply line?
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18/07/2021 2:05 pm
I = 5 A
V = 220 V
R = \(\frac{V}{I}\) = \(\frac{220}{5}\)
= 44Ω
Required resistance is less than 176Ω, so the resistors should be connected in parallel.
Let the required no. be n.
\(R_{eq} = \frac{176}{n}\) = 44
n = \(\frac{176}{44}\)
= 4