Because the unit for current is ampères, or amps, the symbol for it is A. A multimeter measures resistance by sending a small electric current through the circuit. The symbol for the unit of ...

If the multimeter can complete the circuit, a 0.000 will appear on the screen, often joined by a continuous beep. The diode ...

And a voltmeter measures the potential difference ... contact with the hazardous chemicals inside the battery. The circuit symbol for a battery is made by joining two or more cell symbols.