(a) | For a given power level, there is a lower current. |
(b) | Lower current implies less power loss. |
(c) | Transmission lines can be made thinner. |
(d) | It is easy to reduce the voltage at the receiving end using step-down transformers. |
1. | (a), (b), (c) | 2. | (a), (b), (d) |
3. | (b), (c), (d) | 4. | (c), (d) |
A transformer is used to light a and lamp from a main. If the main current is , the efficiency of the transformer is approximately:
1.
2.
3.
4.
1. | and | 2. | and |
3. | and | 4. | and |
A power transmission line feeds input power at to a step-down transformer with its primary windings having turns. What should be the number of turns in the secondary in order to get output power at
1.
2.
3.
4.