To supply electricity from a remote wind farm to a distant city, an energy company must transmit electrical power over long distances. Which combination of current type, voltage level, and benefit is correct for this transmission?
| Type of Current | Voltage Level | Benefit | |
|---|---|---|---|
| A | Alternating current (AC) | High voltage | Reduces energy lost as heat in the cables |
| B | Alternating current (AC) | Low voltage | Increases the current for faster transmission |
| C | Direct current (DC) | High voltage | Decreases the electrical resistance of the cables |
| D | Direct current (DC) | Low voltage | Eliminates the need for substation transformers |
Alternating current (AC) | High voltage | Reduces energy lost as heat in the cables
Alternating current (AC) | Low voltage | Increases the current for faster transmission
Direct current (DC) | High voltage | Decreases the electrical resistance of the cables
Direct current (DC) | Low voltage | Eliminates the need for substation transformers
136 exam-style questions on CIE IGCSE Physics 4.5.6a Construction and operation of a transformer. Each one has a worked solution and a mark scheme showing where the marks go.