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Electric Circuits and Currents
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General Science for Class 7
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Electric Circuits and Currents
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Electric Circuits and Currents
A circuit which connects an electric source to its components, one after another to form a single loop is
series circuit
parallel circuit
open circuit
close circuit
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Electric Circuits and Currents
To reduce the flow of current in an electric circuit and to avoid the danger of overheating resistor is used in a circuit which is called
variable resistor
thermistor
transistor
fixed resistor
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Electric Circuits and Currents
‘Semiconductors’ are used in
dynamos
generators
electronics
electrical appliances
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Electric Circuits and Currents
Energy is equal to
power/distance
power/time
distance x time
power x time
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Electric Circuits and Currents
When the switch is turned off, the iron bar
holds its magnetism
loses its magnetism
gains current
gains voltage
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Electric Circuits and Currents
Maglev trains don’t
ride on the track
fall from the track
repel from the track
stay on the track
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Electric Circuits and Currents
Earth wire is a wire that
is used to earth excess current
insulates excess current
diffuses excess current
recharges voltage
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Electric Circuits and Currents
If more resistors are added in a series circuit the resistance will be
increased
decreased
equal
constant
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Electric Circuits and Currents
The number of charges an atom contains, is
1
2
3
4
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Electric Circuits and Currents
William Sturgeon made first electromagnet in
1820
1825
1920
1925
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