What is electricity and how is it measured?
Electricity is measured in Watts and kilowatts. Electricity is measured in units of power called Watts, named to honor James Watt, the inventor of the steam engine. A Watt is the unit of electrical power equal to one ampere under the pressure of one volt.
The standard measure of electricity consumption is the amount of watts expended over the period of one hour, which is also known as a watt-hour. A kilowatt-hour is 1000 watt-hours, which means using a 4000 watt air-conditioner for one hour will consume 4 kWh of electricity.
- So when this Light Bulb is continuously working for 1 hour, it will consume 100 Watt-hour of energy (100 Watts * 1 hour). when it is continously glowing for 10 hours then it would have consumed 100 watts* 10 hours i.e. 1000 Watt-hours which means 1 kWh(kilo watt hour) or 1 unit of electrical energy (electricity).
- At high voltages (over 110kV), less energy is lost in electrical power transmission. Higher voltages mean lower currents, and lower currents mean less heat generated in the power line due to resistance. AC can be converted to and from high voltages easily using transformers.
- Convert watts to amps using the proper equation: Amps equals watts divided by volts. For example, a typical 60-watt light bulb on a standard 110-volt circuit operates at 0.55 amp (60/110). Convert amps to watts by reversing the equation: Amps multiplied by volts equals watts.
An electric current is a flow of electric charge. In electric circuits this charge is often carried by moving electrons in a wire. It can also be carried by ions in an electrolyte, or by both ions and electrons such as in an ionised gas (plasma). Electric current is measured using a device called an ammeter.
- It is measured in the unit of the Ampere, simply called “Amp,” (A). The most common way to measure current in a circuit is to break the circuit open and insert an “ammeter” in series (in-line) with the circuit so that all electrons flowing through the circuit also have to go through the meter.
- Volt, unit of electrical potential, potential difference and electromotive force in the metre–kilogram–second system (SI); it is equal to the difference in potential between two points in a conductor carrying one ampere current when the power dissipated between the points is one watt.
- The standard metric unit of power is the Watt. As is implied by the equation for power, a unit of power is equivalent to a unit of work divided by a unit of time. Thus, a Watt is equivalent to a Joule/second.
List of electrical and electronic measuring equipment
|Microwave power meter||Measures power at microwave frequencies|
|Multimeter||General purpose instrument measures voltage, current and resistance (and sometimes other quantities as well)|
|Network analyzer||Measures network parameters|
- 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.
- Ampere Meter
- It works like an ammeter, ohmmeter and voltmeter for it can measure current, voltage as well as resistance. Similar to other electrical measuring instruments, multimeters are available in analog and digital types.
Updated: 6th October 2019