very short answer questions :- (a) How the direction of electric current is related to the direction of electron in wire ? Name the instrument used to measure the electric current is a circuit and potential difference between two points.
Answers
a) The direction of current is conventionally taken as opposite to the direction of negative charges that is electrons. So, it is taken as positive to negative cause negative charges move from negative to positive.
>Ammeter is used to measure the Current in a circuit. It is connected in series. It has low resistance
>Voltmeter is used to measure potential difference in a circuit. It is connected in parallel. It has high resistance.
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Answer:
The direction of an electric current is by convention the direction in which a positive charge would move. Thus, the current in the external circuit is directed away from the positive terminal and toward the negative terminal of the battery. Electrons would actually move through the wires in the opposite direction.
➡️A voltmeter is an instrument used for measuring electrical potential difference between two points in an electric circuit.
➡️An ammeter is a measuring device used to measure the electric current in a circuit.