K.C.S.E Physics Q & A - MODEL 1995PP2QN05
(a) (i) State the law of electromagnetic induction
(ii) Describe an experiment to demonstrate Faraday's law
(b) (i) A researcher studying the behaviour of step- up transformer made the following observations:
More joules per coulomb and fewer coulombs per second at the output than at the input terminals
Explain why the observation does not imply a violation of the principle of conservation of energy
(ii) A transformer of 480 turns in the primary coil is used to connect a 9 volt a.c electric device to a 240 v.a.c mains power supply. Calculate the number of turns in the secondary coil.
. (a) (i) The magnitude of the induced e.m.f is directly proportional to the rate at which the conductor cuts the magnetic field lines
The induced current flows in such a direction as to oppose the changes producing it.
(ii) Plugging a magnetic into a coil
Make power constant
VU = Joules current = charge / time
P = IV
For large V, 1 must lower for power input to be equal to power output
FORM I - PHYSICS SYLLABUS
FORM II - PHYSICS SYLLABUS
FORM III - PHYSICS SYLLABUS
FORM IV - PHYSICS SYLLABUS
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