Transformer is used for
A. Converting AC into DC
B. Converting DC into AC
C. To step up DC voltages
D. To step up or step down AC voltages
Answer: Option D
A. Converting AC into DC
B. Converting DC into AC
C. To step up DC voltages
D. To step up or step down AC voltages
Answer: Option D
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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