(a) State Fleming's right hand rule.
(b) (i) Name the electric device that converts mechanical energy into electrical energy
(ii) Write the principle involved in this device.
(c) An electric geyser of 2kW rating is operated in a domestic circuit operating on 220V
main supply that has a fuse of cuurent rating of 5A. What will be outcome? Explain
Answers
Answer:
A) Fleming's right-hand rule gives which direction the current flows. The right hand is held with the thumb, index finger and middle finger mutually perpendicular to each other (at right angles), as shown in the diagram. The thumb is pointed in the direction of the motion of the conductor relative to the magnetic field.
B) i) Electric generator
ii) A generator converts mechanical energy into electrical energy, while a motor converts electrical energy into mechanical energy. Both the devices work because of electromagnetic induction, which is when a voltage is induced by a changing magnetic field.
C) Given,
Power=2kw=2000W,current=5A,voltage=220V
So power=current×voltage⇒current=
voltage
power
⇒
220
2000
=9A
Thus the current will exceeds and the fuse will burn out if there is no fuse then overloading will cause melting of wires which will cause the short circuit which will cause a fire.
Explanation:
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