Auto parts store is the best place. Check the section where they have battery supplies.
Use a voltmeter.
A personal computer's power supply receives 120 volts of AC and converts it to 3.3, 5, 12 volts of DC power.Another answerThe secondary voltage could be any number of voltages depending on what the power supply was designed for. Your best bet is to get a DC voltmeter and measure the output voltage of each wire on the output side.
moving coil & moving iron
The components of NIC are : buffer pulse transformers lan dc/dc converters lan filters
A: The function is to change the pulsating DC into a smooth DC by removing the peak changes. The results are very little AC variation riding on top of the DC value or simply referred as ripple.
It is a voltmeter which can only measure direct current.
A: It is a regular DC voltmeter but the AC is rectified and the DC component is measured and displayed as AC VOLTS.
Red wire from a regular DC voltmeter should be connected to :
A DC voltmeter is ideal.
The primary application of a digital DC voltmeter is to display the amount of DC current present in a circuit. This is particularly handy when troubleshooting problems.
Polarity
You cant.
voltmeter
There is no volt meter or amp meter in a DC watt meter.
Any standard voltmeter but however the voltage to be measured must be stepped down to a safe value using a Potential transformer.
power i.e current and voltage or ammeter and voltmeter
Here we will just connect DC generator shaft with motor's rotating spindle. Now connect voltmeter across dc gen. and just calibrate voltmeter in terms of rpm. If you have worked with micro-controllers then it will be very easy using it's ADC input.