Comprehension Questions: Power and Energy

Descripción

This is a short lesson about power and energy of electricity
Nursultan Zhakupov
Test por Nursultan Zhakupov, actualizado hace más de 1 año
Nursultan Zhakupov
Creado por Nursultan Zhakupov hace más de 7 años
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Resumen del Recurso

Pregunta 1

Pregunta
An electric heater uses 60 kJ of electrical energy in five minutes. What is the power rating of the heater?
Respuesta
  • 720 kW
  • 12 kW
  • 1.2 kW
  • 200 W

Pregunta 2

Pregunta
A small heater has a rating of 15V, 4A. How much energy does it consume if it is turned on for two minutes?
Respuesta
  • 7.5 J
  • 120 J
  • 450 J
  • 7200 J

Pregunta 3

Pregunta
Figure shows the electrical information of an electrical appliance. (a) What is the current generated if the casserole is turned on at normal operating voltage of 230V and a power of 1400 W?
Respuesta
  • 0.16 A
  • 6.1 A
  • 28 A
  • 322 A

Pregunta 4

Pregunta
(b) How much electrical energy is consumed for one month (30 days), if the casserole is turned on for 2 hours everyday?
Respuesta
  • 2.8 kJ
  • 42 kJ
  • 84 kJ
  • 302 MJ
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