Question

Please help with these questions​

Answer 1

Answer:

Explanation:

What is the direction of electric current?

• 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 source of alternating current?

• Alternating current (ac) is the flow of electric charge that periodically reverses direction. An ac is produced by an alternating emf, which is generated in a power plant, as described in Induced Electric Fields. If the ac source varies periodically, particularly sinusoidally, the circuit is known as an ac circuit.

A device which is used to on and off the circuit

• switch

Answer: A switch is a simple device that either breaks the circuit or  completes it. If the switch is “ON” then the current flows through the circuit  and when the switch is “OFF” then the current cannot flow through the  circuit.

the device used to change the resistance in a circuit

• Rheostat

Rheostat is used to vary the resistance of a circuit.

a device used to control the current in a circut

• Circuits are designed for a specific voltage and resistance so that the current flow will be known. ... To prevent disasters, electrical circuits contain devices such as electrical fuses, circuit breakers, and surge protectors to control the amount of current in the circuit.

a device to measure the current

• ammeter

• A d'Arsonval meter is a type of ammeter, which is an instrument for detecting and measuring electric current.

a device used to detect current

• ammeter

• An ammeter (from Ampere Meter) is a measuring instrument used to measure the current in a circuit. Electric currents are measured in amperes (A), hence the name.

a device to measure the potential difference

• 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.

hope this helps

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