A transformer
A. converts DC to AC
B. is used to decrease or increase AC voltage
C. converts AC voltage to DC voltage
D. converts electrical energy into mechanical energy
Answer: Option B
A. converts DC to AC
B. is used to decrease or increase AC voltage
C. converts AC voltage to DC voltage
D. converts electrical energy into mechanical energy
Answer: Option B
What will be the total resistance of the three 20-Ω coils connected in series?
A. 40 Ω
B. 20 Ω
C. 60 Ω
D. 800 Ω
Superconductors are substances which
A. conduct electricity at lower temperature
B. offer high resistance to the flow of current
C. offer not resistance to the flow of current
D. conduct electricity at high temperature
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