Which of the following is the purpose for which a transformer is used?
A. To convert AC into DC
B. To convert DC into AC
C. To step-up or step-down AC voltage
D. To step-up DC voltage
Answer: Option C
A. To convert AC into DC
B. To convert DC into AC
C. To step-up or step-down AC voltage
D. To step-up DC voltage
Answer: Option C
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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