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Get Answers to all your Questions
(a) State Fleming’s Left-hand rule.
(b) List three characteristic features of the electric current used in our homes.
(c) What is a fuse ? Why is it called a safety device ?
(d) Why is it necessary to earth metallic electric appliances ?
Answers (1)
(a) Flemings’ Left hand rule: Stretch the thumb, forefinger and middle finger of your left hand such that they are mutually perpendicular. If the forefinger points in the direction of magnetic field, middle finger in the direction of current , then the thumb will point in the direction of motion or force acting on the conductor.
(b) Three characteristic features of the electric current used in our homes-
i. Reverses direction periodically.
ii.Frequency of 50 Hz.
iii. Potential difference between live wire and netural wire is about 220V.
(c) Fuse is a safety device used in a circuit (or appliance) to prevent damage due to overloading/ short circuiting
- It protects the circuit ( or appliance) by stopping the flow of any unduly high electric current / If current larger than the specified valueflows through the circuit , due to Joule’s heating effect the fuse wire melts and breaks the circuit
(d) It is necessary to earth metallic electric appliances because It provides a low resistance conducting path for the current and protects the user from electric shock due to leakage of current.
