Electrical Safety and Measurement
Meters, protective devices, wiring colours and working safely. Unhurried, with an explanation after every answer.
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Which instrument measures resistance?
- Ohmmeter
- Wattmeter
- Voltmeter
- Frequency meter
A digital multimeter can usually measure:
- Only temperature
- Voltage, current and resistance
- Only power factor
- Only voltage
Which instrument tests insulation resistance at high voltage?
- Oscilloscope
- Tachometer
- Ammeter
- Megger (insulation resistance tester)
Which instrument measures electrical power directly?
- Voltmeter
- Ammeter
- Wattmeter
- Galvanometer
What does an energy meter measure?
- Energy consumed, usually in kWh
- Instantaneous current
- Insulation resistance
- Frequency
What does an oscilloscope display?
- Voltage waveforms against time
- Energy in kWh
- Temperature
- Resistance only
A clamp meter is useful because it measures current:
- Without breaking the circuit
- Only in DC circuits
- Only at very low values
- By measuring resistance
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