ACTIVITY 3
1. A moving coil galvanometer has coil
resistance 20Ω and can carry a maximum of 15 mA.
a)
What is
the value of the shunt required to enable the galvanometer register 10 A
full-scale deflection? How will the shunt be connected?
b)
What is
the value of the multiplier required to enable the galvanometer register 10 V
full-scale deflection? How will the multiplier be connected?
2. What happens
if a current carrying conductor is placed in a magnetic field?
3. When does a
current carrying conductor experience a maximum force in the magnetic field?
4. What is the
use of a commutator in an electric motor?
5. Describe the structure and mode of action
of a simple d.c motor.
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