Meters (a) When Voltmeter ) Ammeter i) Ohmmeter (b) When connecting red and blac

Question

Meters (a) When Voltmeter ) Ammeter i) Ohmmeter (b) When connecting red and black probes to the digital multimeter to be used in the voltmeter mode, for the three basic connection on the DMM (labeled Amps, COM and v., in which hoke should the red and black probes be inserted? Red * Black = (c) If the voltmeter indicates a positive voltage for the potential difference across a resistor, current flows from red to black through the resistor, or black to red? 2. What minimum applied voltage would "blow" a 1 /2 watt rated, 80 resistor?

Explanation / Answer

a

1)

Voltmeter : in parallel , since the voltage remain same in parallel

2)

Ammeter : in series , Since the current remain same in series.

3)

ohmmeter : in parallel

2)

P = 0.5 W

R = 80 ohm

V = Voltage

using the equation

P = V2/R

V = sqrt(PR) = sqrt(0.5 x 80) = 6.32 Volts

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