Question #202761

a block of iron mass 60kg must be heated from 20 degrees Celsius to 300 degrees Celsius. the specific heat capacity of iron is470J/kg k. the effeciencyof the system is 71%. the available supply voltage is. 230V. the process must be completed within 2 hours. if electricity from eskom is presentlyR1, 77 kilometers per hour. determine the value of current drawn from the source and the total cost of the process

Expert's answer

Part a

P=VI

"\\frac{W}{t}=VI"

"\\frac{mc \\triangle T}{t}=VI"

"I=\\frac{mc \\triangle T}{Vt}=\\frac{60 *470* 573-293 }{230 *2*60*60}=4.768 kW"

Part b

"1kWh = R1, 77"

"4.768kWh = \\frac{R177*4.768}{1}=R843.96"

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