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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
In series, if one bulb goes out, others will
stay on
also turn off
blow up
heat up
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Electric Circuits and Currents
Circuit breakers work
constantly
only once
when there is resistance
when there is magnetic field
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Electric Circuits and Currents
The best fit fuse for the hair drier that requires ‘2A’ current is
5A
4A
3A
2A
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Electric Circuits and Currents
The instrument which is used to measure electric current is called
ammeter
cell
battery
galvanometer
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Electric Circuits and Currents
Radio, TV, CD Player and sound system have
loudspeakers
microphones
antennas
cathode tubes
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Electric Circuits and Currents
Resistance is the friction in an electrical circuit that controls the flow of
current
voltage
light
electricity
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Electric Circuits and Currents
The electrons move from
positive to negative terminal
negative to positive terminal
both a and b
positive to positive terminal
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Electric Circuits and Currents
To make the coil keep rotating, the current is reversed after every half turn by a device called
brush
commutator
mutator
carbon spring
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Electric Circuits and Currents
The consumed number of units of electricity can be found by applying formula
Power/distance
Power/time
Distance x Time
Power x Time
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Electric Circuits and Currents
1000mA of current is equal to
1A
10A
100A
0.1A
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