An appliance has an exposed metal casing. If the live wire inside the appliance becomes loose and touches this metal casing, a hazard is created. Which row in the table correctly identifies the danger to a user touching the casing, and the safety features that prevent this danger?
| Danger to a user | Safety features | |
|---|---|---|
| A | They could receive a lethal electric shock. | An earth wire and a fuse. |
| B | They could receive a lethal electric shock. | A diode connected in series. |
| C | The high voltage will cause the appliance to explode. | An earth wire and a fuse. |
| D | The high voltage will cause the appliance to explode. | A diode connected in series. |
Danger: They could receive a lethal electric shock. Safety features: An earth wire and a fuse.
Danger: They could receive a lethal electric shock. Safety features: A diode connected in series.
Danger: The high voltage will cause the appliance to explode. Safety features: An earth wire and a fuse.
Danger: The high voltage will cause the appliance to explode. Safety features: A diode connected in series.
135 exam-style questions on CIE IGCSE Physics Electrical safety, covering Electrical safety. Each one has a worked solution and a mark scheme showing where the marks go.