YASH CLASSES
ELECTRIC CURRENT
114. Define the term electric
power ?
Derive it. write
S.I unit .
115. What is commercial unit
of power.
Define kWh .
116. An electric motor
takes 5 A current
from
220V line . Determine
the power
of the
motor and the
energy consumed
in
2 h .
117. An electric motor
takes 2 A current
from
210 V line . Determine
the power
of
the motor and
the energy consumed
in
5 h .
118. An electric motor
takes 2.5 A current
from
440 V line . Determine
the power
of
the motor and
the energy consumed
in
30 min .
119. A
torch bulb is rated
at 1.25 V and
current flow
on it 2.5 mA . find
[a] power [b]
resistance
120. A
torch bulb is rated
at 1. 5 V and
current flow
on it 2 mA . find
[a] power [b]
resistance
121. A
torch bulb is rated
at 0.25 V and
current
flow on it 1.5 mA . find
[a] power [b]
resistance
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