What instrument is used to measure electric current?
An ammeter (from Ampere Meter) is a measuring instrument used to measure the current in a circuit. Electric currents are measured in amperes (A), hence the name. Instruments used to measure smaller currents, in the milliampere or microampere range, are designated as milliammeters or microammeters.
A voltmeter is an instrument used for measuring electrical potential difference between two points in an electric circuit. Analog voltmeters move a pointer across a scale in proportion to the voltage of the circuit; digital voltmeters give a numerical display of voltage by use of an analog to digital converter.
- List of electrical and electronic measuring equipment
Name Purpose Ammeter (Ampermeter) Measures current Capacitance meter Measures the capacitance of a component Curve tracer Applies swept signals to a device and allows display of the response Cos Phi Meter Measures the power factor
- The direction of an electric current is by convention the direction in which a positive charge would move. Thus, the current in the external circuit is directed away from the positive terminal and toward the negative terminal of the battery. Electrons would actually move through the wires in the opposite direction.
- Working Principle of Voltmeter. The main principle of voltmeter is that it must be connected in parallel in which we want to measure the voltage. Parallel connection is used because a voltmeter is constructed in such a way that it has a very high value of resistance.
A frequency meter is an instrument that displays the frequency of a periodic electrical signal. Various types of frequency meters are used. Many are instruments of the deflection type, ordinarily used for measuring low frequencies but capable of being used for frequencies as high as 900 Hz.
- See, for example, the Wheatstone bridge. The Wien bridge is one of many common bridges. Wien's bridge is used for precision measurement of capacitance in terms of resistance and frequency. It was also used to measure audio frequencies.
- sound level meter
- Ampere Meter
List of electrical and electronic measuring equipment
|Ammeter (Ampermeter)||Measures current|
|Capacitance meter||Measures the capacitance of a component|
|Curve tracer||Applies swept signals to a device and allows display of the response|
|Cos Phi Meter||Measures the power factor|
- In the past, a common time measuring instrument was the sundial. Today, the usual measuring instruments for time are clocks and watches. For highly accurate measurement of time an atomic clock is used. Stop watches are also used to measure time in some sports.
- Explanation: Voltmeter - is used to measure electric potential difference between two points, Wavemeter - is used to measure the wavelength of a radiowave, Viscometer - is used measure viscosity of liquid.
- Spring balances or spring scales calculate weight that is the product of mass into gravity (9.807 m/s2) on the force on a spring, whereas a balance or pair of scales using a balance beam compares masses by balancing the weight due to the mass of an object against the weight of one or more known masses.
Updated: 6th October 2018