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A watt meter is what the power suppliers have on the side of your house to monitor the use of electricity going into your home. These can also be bought at electrical wholesale suppliers. There is a second kind of watt meter that measures in the RF frequencies. It is connected into the coxial cable on the output side of a transmitter. These can be purchased at radio shops that sell amateur radio equipment.
Additional AnswerActually, what you have on the side of your house to monitor your use of electricity is an energy meter, not a wattmeter.
Wattmeter are used to measure power. Your electricity meter is used to measure energy, expressed in kilowatt hours.
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ViviOne way to make a voltmeter is to take a small ammeter, in the microamp to millamp range, measure or (preferably) know its resistance, and figure out how much series resistance you need to measure a known voltage and generate the current required to achive the desired deflection. Typically, you provide a switch to select the various range resistors, and you repaint the scale accordingly.
Be careful measuring the microammeter's resistance - it is very easy to overrange and damage it. Best is to calculate the series resistance required to develop full scale current, build a resistor and potentiometer with a voltage source, adjust for full scale, and then measure the resistor network's impedance with a good ohmmeter. (Out of circuit, of course.)
Local hardware store, Home Depot, Lowes, Radio Shack and almost any place you can get electric supplies. You can get a useful meter for around $20 with more sophisticated meters costing hundreds of dollars.
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How is voltage measured?
Use a voltmeter with a high input impedance and measure at the source the voltage.
Why does the total emf of dry cell in series not equal in the reading of voltmeter?
because in ckt connection there r done some ohmic loss due to the connecting wires and other factor , so voltmeter reading is not equal to its rated reading. and this also done due to different error like instrument error , measurement error etc...
How do you tell if the alternator is bad in a 2000 jeep Cherokee sport?
Borrow a digital DC voltmeter, attach the meter to the positive and negative battery posts, if the battery is healthy and fully charged it should read 12.68 volts, now start the engine and monitor the voltmeter, if the battery is fully charged and the alternator is healthy the meter should read 14.2 volts (give or take .3). If the voltage fails to reach that goal the alternator is probably faulty.
My tail light works on both sides but my brake light which is the same bulb is not working on the passenger side. I changed the bulb but the brake light still does not work. What could my problem be.?
You could have a bad wire going to the socket. You can test the connection with a voltmeter. If you are unsure of where to connect the voltmeter try it on the good side first when someone is applying the brakes to see how to connect the meter. Then try the bad side and if you can't get a reading you have a wire or connection problem on the bad side. The taillight bulb has two filaments One is used for the normal tail light and the other filament is used when you step on the brake. When you step on the break both filaments are on at the same time to give the extra brightness. Take the bulb out and check the continuity of both filaments to make sure that they not burned out.
How do you troubleshoot the 1993 Volvo 940 radio mast motor if it does not work on radio turn on?
-- Can you access the two power connections on the motor ? If so, touch a voltmeter to the power terminals and verify the appearance of 12 volts DC there when the radio is turned on. -- If no volts there, then the problem is wiring, or a fuse, or the motor-output-voltage from the radio. -- If volts are there but the antenna doesn't raise, then the motor is shot. Replace it, or pull the antenna up and leave it up, like the commoners do. -- If you can't access the motor connections, or you don't have a voltmeter available, then you'll have to send the whole thing back to Sweden for service.
