Chapter Electricity... Urgent...please help...
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Chapter Electricity... Urgent...please help...
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In the case of the ammeter below (A), if current flows through the ammeter from red terminal to black terminal then the current will appear as a positive reading. If the current is in the opposite direction then the ammeter will display a negative reading.
Similarly in the case of the voltmeter (V). If the red probe is touching a node at a higher potential than the node touching the black probe, then the voltmeter will read a positive number and will read a negative number if the potentials are other way round.