A ______ is a combined unit of ampere meter, voltmeter and ohmmeter.
multi-meter
Understanding the Combined Electrical Measurement Unit
Electrical circuits and components require various measurements to understand their performance and troubleshoot issues. Key electrical properties include current, voltage, and resistance.
- An ammeter is used to measure the electric current flowing through a circuit, typically in units called amperes (A).
- A voltmeter measures the electric potential difference or voltage across two points in a circuit, expressed in volts (V).
- An ohmmeter is designed to measure electrical resistance, the opposition to current flow, in units called ohms ($ \Omega $).
A single instrument that integrates the functions of these three fundamental meters (ammeter, voltmeter, and ohmmeter) is known as a versatile and essential tool in electronics and electrical work.
Identifying the Combined Meter
The question asks to identify the device that serves as a combined unit of an ampere meter, voltmeter, and ohmmeter. Let's examine the options:
| Option | Description | Relevance |
| clip-on meter | A clamp meter used primarily to measure current without physically connecting the meter in series with the circuit. It often includes voltage and resistance functions but is distinct in its primary current measurement method. | Does not primarily combine all three functions in the traditional sense. |
| power factor meter | Measures the ratio of real power to apparent power in an AC circuit (the power factor). It assesses the phase relationship between voltage and current. | Measures a different electrical property (power factor), not current, voltage, and resistance directly. |
| tongue tester | This term is not standard for electrical measuring instruments and likely refers to an incorrect or colloquial name. | Not a recognized electrical measurement tool for these functions. |
| multi-meter | An electronic measuring instrument that combines several measurement functions in one unit. A typical multimeter includes features of an ohmmeter, voltmeter, and ammeter. | Directly matches the description of combining ampere meter, voltmeter, and ohmmeter functions. |
Based on the definitions and functions, the instrument that combines the capabilities of an ampere meter, voltmeter, and ohmmeter is the multi-meter. It is a fundamental tool for electricians, technicians, and hobbyists for testing voltage levels, measuring current flow, and checking resistance in various electrical and electronic circuits.
Important Questions from Measurement of Resistance
Which of these instruments is used for measuring the insulation resistance?
A zero to 300 V voltmeter has an error of 2% of the full scale deflection. If the true voltage is 30 V, then the range of readings on this voltmeter would be
The operating voltage of a megger is about
Which instrument is used to measure the high resistance?
Megger is essentially a:
