- 1(current)
Q. No.An alternating current having a peak value \(14~\text A\) is used to heat a metal wire. To produce the same heating effect, a constant current \(i\) can be used, where the value of \(i\) is:
1. \(14~\text A\)
2. about \(20~\text A\)
3. \(7~\text A\)
4. about \(10~\text A\)
Subtopic: Â Power factor |
 66%
Level 2: 60%+
Hints
An AC source rated \(100~\text{V}\) (rms) supplies a current of \(10~\text{A}\) (rms) to a circuit. The average power delivered by the source:
| (a) | must be \(1000~\text{W}\). |
| (b) | may be \(1000~\text{W}\). |
| (c) | may be greater than \(1000~\text{W}\). |
| (d) | may be less than \(1000~\text{W}\). |
| 1. | (a) only |
| 2. | (b), (c) |
| 3. | (b), (d) |
| 4. | (a), (d) |
Subtopic: Â Power factor |
 64%
Level 2: 60%+
Hints
- 1(current)
Q. No.
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