K.C.S.E Physics Q & A - MODEL 2014PP2QN14
(a) Figure 6 shows a simple electric bell circuit
(i) Name the parts labelled:
(ii) When the switch is closed, the hammer hits the gong repeatedly. Explain why:
(I) the hammer hits the gong.
(II) the hammer hits the gong repeatedly.
(b) An electric bulb is rated 60 W, 240 V. Determine:
(i) the current that flows through it when it is connected to a 240 V supply.
(ii) the resistance ol the bulb.
(a) (i) I D - soft iron armature
II E contacts
(ii) I. Soft iron core is magnetized and attracts the armature the hammer hits
II. Contact is broken when armature is attracted by the core. The core then loses magnetism.
The armature loses magnetism and springs back making contact again and the process is repeated.
FORM I - PHYSICS SYLLABUS
FORM II - PHYSICS SYLLABUS
FORM III - PHYSICS SYLLABUS
FORM IV - PHYSICS SYLLABUS
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