ElectromagnetismEveryday Science
To increase or decrease AC voltages, we use
fuse
circuit breaker
transformer
generator
transformer
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Vitamin C is soluble inA. fat
B. water
C. ethers
D. phenols
It is made of many loops mounted on a shaft or axle
A. fuse
B. transformer
C. armature
D. circuit
A transformer is designed to convert the voltage from 240 V a.c mains to 12 V, and has 4000 turns on its primary coil. If it is 100% efficient, and the current in the secondary coil was 0.4 A then the current in the primary coil should be
A. 0.08 A
B. 0.05 A
C. 0.02 A
D. 0.01 A
The number of coils in a transformer is
A. 2
B. 3
C. 4
D. 5
In the transformer, if the secondary voltage is more than the primary voltage then it is called
A. step up transformer
B. step down transformer
C. inductor
D. resistor
An ideal transformer dissipates by itself
A. low power
B. high power
C. no power
D. none of above
A transformer is needed to convert 200 V into a 10 V supply. If there are 1000 turns on the primary coil, then the number of turns on the secondary coil is
A. 100
B. 2000
C. 75
D. 500
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