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A TV uses 2.862 MJ when it works for 180 minutes. What is the power of the TV ?
Cables have 100 Ω resistance. Calculate the power wasted heating the cables when the current is 0.5 A.
A device is rated at using 4.2 A. What fuse rating is most appropriate?
A mains-operated television requires 0.25 A. What is the approximate power rating?
Which of the following is not a safety feature for use with mains electricity?
Which of the following best describes mains electricity?