Between 08:00 h and 14:00 h a small workshop uses the following electrical…
PHYSICS · Multi-part · CBSE · Physics · Current Electricity · Current Electricity
Problem
Between 08:00 h and 14:00 h a small workshop uses the following electrical appliances:
• A room heater rated 500W is switched on at 08:00 h and switched off at 12:30 h.
• A fluorescent lamp rated 100W is switched on at 09:15 h and remains on until 14:00 h.
• A microwave oven rated 1500W is operated from 12:00 h to 12:15 h only.
Answer the questions below:
(i) List the time intervals during which each appliance is drawing power.
(ii) Calculate the total electrical energy consumed by the workshop in the six-hour period from 08:00 h to 14:00 h, giving your answer in kilowatt-hour.
(iii) Determine the average electrical power drawn from the supply during this six-hour period.