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A resistance R is connected across the terminal of an electric cell of internal resistance 2Ohms and the voltage was reduced to 3/5 of its nominal value. The value of R is
A working electric motor takes a current of 1.5A when the p.d. across it is 250V. If its efficiency is 80%, the power output is
The cost of running five 60 W lamps and four 100W lamps for 20 hours if electrical energy costs N10.00 per kWh is
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