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There are a couple of kinds of watt-hour meters: one is an electromechanical type (the one with the spinning wheel), and the other is a solid-state type. The solid-state types generally use a current transformer to measure the current produced in the current-carrying conductors, which means that the current carrying conductors need not be connected to the actual measuring device.) The electromechanical type uses an aluminum disc acted upon by two coils. One coil is positioned in such a way as to produce a magnetic flux in proportion to the voltage on the disc, and the other coil produces a magnetic flux proportional to the current. This causes the disc to rotate at a speed proportional to the power (voltage times current) being used. A permanent magnet is also installed in such a way as to exert an opposing force in proportion to the rotating speed of the disc. This causes the disc to slow down and stop when energy stops being used. The aluminum disc is also attached to a worm gear which drives the register.
Wiki User
∙ 12y ago
Wiki User
∙ 12y agoA watt is the electric unit of power. Amperage x voltage = watt. 746 watts is one horsepower. A wattmeter measures power.
AnswerA wattmeter measures the voltage applied to a circuit, the resulting current, and the cosine of the angle between them, allowing it to indicate the true power of a circuit, in watts, regardless of the nature (resistive, inductive, or capacitive) of its load.
Incidentally, the watt is the SI unit for power, it is not the 'electric unit' of power, as there is no such thing as 'electric power'.
Wiki User
∙ 15y agoThere are two main types of wattmeters. Electrodynamometers (electromechanical) and digital. Electromechanical meters are described below. The theory of electrodynamometers was developed by Elihu Thomson and Thomas Edison in 1888. Until then the only meter available was a zink plate meter (very unreliable and inaccurate) and a light meter which basically detected if the lights were on and turned on a clock if they were. When power is consumed, (such as in a light bulb) a current flows through the conductor. This current flow also produces a magnetic field which can be picked up using voltage and current coils within the electrodynamometer. When current flows it is induced onto the coils which causes a rotor to roate inside the stator casing of the meter. The rotation of the rotor causes the display dials to count up at certain values per rotation. This is all configured by the supplier of the meters or utility using magnets within the meter.
Wiki User
∙ 10y agoThe wattmeter is an instrument to measure the electrical power.
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What does a watt- hour measure?
A watt meter measures the electric power in watts from circuits. They can measure utility frequency, audio frequency power and radio frequency measurement.
Why you reset the zero point on the watt meter?
So that the result that you find on the watt meter after resetting it will be accurate
1 watt hour equals how many watts?
1 watt-hour equals 1 watt times 1 hour, or 3600 joules.
Is a 1000 watt load that operates for one hour consumes the same about of energy as A100 watt load that operates for 10 hours?
Yes. The energy consumption in both cases is 3.6 megajoules or 1 kilowatt-hour. That's what registers on the meter outside, and that's what you pay for.
What is a meter socket?
The electrical power that you use from the utility company has to be metered. This is done with a plug in watt meter. The meter socket is what holds the electrical watt meter. It is this meter that the meter reader reads to give you your monthly billing for the electricity that you used.
If this month the meter read 2714 watt hour at 0.08 per watt what will Ralph bill this month?
Ralph who? Where does he live?
Basic components of watt-hour meter instruments?
See...wiki.answers.com/Q/How_does_a_watt-hour_meter_work
How much power is used by a 35w bulb with 12v supply vs 110v supply?
it also depends on what meter you have, is it a KWH METER or a AH METER. IF ITS A KWH METER(KILO WATT HOUR) IT COUNTS IN WATTS (35w PER HOUR.)
How many voltmeter and ammeter are in dc watt meter?
There is no volt meter or amp meter in a DC watt meter.
What does a watt- hour measure?
A watt meter measures the electric power in watts from circuits. They can measure utility frequency, audio frequency power and radio frequency measurement.
What are terms for energy?
BTU, calorie, erg, foot pound, electron volt, watt hour, newton meter
How do you check revolution of the watt-hour meter for three phase in one second if the power is 1KW?
Your idea is quite impractical.
Why you reset the zero point on the watt meter?
So that the result that you find on the watt meter after resetting it will be accurate
1 watt hour equals how many watts?
1 watt-hour equals 1 watt times 1 hour, or 3600 joules.
What is the relation between Newton meter and watt?
1 Watt = 1 Joule / Second = 1 Newton-meter / Second.
Is a 1000 watt load that operates for one hour consumes the same about of energy as A100 watt load that operates for 10 hours?
Yes. The energy consumption in both cases is 3.6 megajoules or 1 kilowatt-hour. That's what registers on the meter outside, and that's what you pay for.
What is a meter socket?
The electrical power that you use from the utility company has to be metered. This is done with a plug in watt meter. The meter socket is what holds the electrical watt meter. It is this meter that the meter reader reads to give you your monthly billing for the electricity that you used.
