Alternating current can not be measured by DC ammeter because
A. AC cannot pass through DC ammeter
B. average value of complete cycle is zero
C. AC is virtual
D. AC changes its direction
Answer: Option B
A. AC cannot pass through DC ammeter
B. average value of complete cycle is zero
C. AC is virtual
D. AC changes its direction
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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