Answer to Question #252540 in Electrical Engineering for Kehinde

Question #252540
  • The electrical load in a small workshop consists of 14 lamps, each rated at 240volt, 60watt and 3 electric fire, each rated at 240, 1kw. What is the effective resistance of the load
1
Expert's answer
2021-10-18T03:45:02-0400

Resistance of a one lamp

"R_1=\\frac{V_1^2}{P_1}=\\frac{240^2}{60}=960\\:\\Omega"

Resistance of a one electric fire

"R_2=\\frac{V_2^2}{P_2}=\\frac{240^2}{1000}=57.6\\:\\Omega"

The net resistance

"R=\\frac{1}{\\frac{14}{R_1}+\\frac{3}{R_2}}=\\frac{1}{\\frac{14}{960}+\\frac{3}{57.6}}=15\\:\\Omega"


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