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13. When in use, a 400V commercial incinerator reaches a maximum temperature of 5000 degrees celcius. The incinerator draws 30 kC during an operating time of 20 minutes.
a) Calculate the power of the incinerator
b) Calculate the current through the incinerator
14. The motor of a lift is rated at 2 kW and has a mass of 1000 kg. The load of the lift is 1000 kg. The lift moves upwards at maximum power for 50 s. During this period 174 C passes through the motor.
a) Calculate the potential difference applied to the lift
b) Calculate the electrical resistance of the lift motor
c) The change in height of the lift during this period is 1.2m. Assuming that the value for the gravitational constant is 10 N/kg, calculte the effiency of the lift's motor.

Explanation isn't required, but would be appreciated. Thanks!

Sagot :

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