Podcast
Questions and Answers
What is the primary function of a voltmeter in an electrical circuit?
What is the primary function of a voltmeter in an electrical circuit?
- To measure electrical resistance in ohms
- To test insulation resistance
- To measure the potential difference between two points (correct)
- To measure current in amperes
Which of the following instruments can measure current without physical contact with the conductor?
Which of the following instruments can measure current without physical contact with the conductor?
- Ammeter
- Voltmeter
- Ohmmeter
- Clamp meter (correct)
Which instrument is specifically designed to measure insulation resistance?
Which instrument is specifically designed to measure insulation resistance?
- Megger (correct)
- Multimeter
- Energy meter
- Wattmeter
What does a multimeter NOT measure?
What does a multimeter NOT measure?
In the context of electrical measuring instruments, what unit does an ammeter measure?
In the context of electrical measuring instruments, what unit does an ammeter measure?
Which of the following correctly describes a wattmeter?
Which of the following correctly describes a wattmeter?
An energy meter is primarily used for what purpose?
An energy meter is primarily used for what purpose?
Which of the following instruments is also known as a voltage meter?
Which of the following instruments is also known as a voltage meter?
What type of instrument is specifically used to safeguard electrical systems from current leakages?
What type of instrument is specifically used to safeguard electrical systems from current leakages?
What characteristic does a clamp meter provide that distinguishes it from a standard ammeter?
What characteristic does a clamp meter provide that distinguishes it from a standard ammeter?
Flashcards
Voltmeter
Voltmeter
Measures voltage (potential difference) between two points in a circuit.
Ammeter
Ammeter
Measures electric current in a circuit.
Clamp Meter
Clamp Meter
Measures current without physical contact, by clamping around a wire.
Ohmmeter
Ohmmeter
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Megger
Megger
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Wattmeter
Wattmeter
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Multimeter
Multimeter
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Energy Meter
Energy Meter
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Insulation Resistance
Insulation Resistance
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Electrical Power
Electrical Power
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Study Notes
Electrical Measuring Instruments
- Voltmeter: Used to measure potential difference (voltage) between two points in an electrical or electronic circuit. Also known as a voltage meter.
Electrical Measuring Instruments Continued
- Ammeter: Used to measure current in a circuit. Electric current is measured in amperes, hence the name.
Electrical Measuring Instruments Continued
- Clamp Meter: Also known as a current probe. An electrical device with jaws that open to allow clamping around an electrical conductor. Allows current measurement without physical contact or disconnection. Probes can also measure voltage.
Electrical Measuring Instruments Continued
- Ohmmeter: An electrical instrument used to measure electrical resistance.
Electrical Measuring Instruments Continued
- Megger: A megohmmeter or insulation resistance tester is a specialized ohmmeter used to measure the insulation resistance of wires, cables, and electrical equipment. Used in safeguarding electrical systems from electrical shock or sudden discharge of current leakage.
Electrical Measuring Instruments Continued
- Wattmeter: An instrument for measuring electric power in watts of any given circuit.
Electrical Measuring Instruments Continued
- Multimeter: Also known as a VOM (volt-ohm-milliammeter), a combined electronic measuring instrument for voltage, current, and resistance measurements in a single unit.
Electrical Measuring Instruments Continued
- Energy Meter: Also called electricity meter, electric meter, or energy meter; measures the amount of electrical energy consumed by a residence, business, or electrically powered device.
Electrical Measuring Instruments Continued (Summary Table)
- Parameter | Measuring Instrument
- --|---| Voltage | Voltmeter Current | Ammeter Power | Wattmeter Energy | Energy Meter Resistance | Ohmmeter Voltage, Current, and Resistance | Multimeter Voltage, Current, and Resistance | Clamp Meter Insulation Resistance | Megger
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