14. an electric current will flow in a circuit, but only as long as either the _______, or the _______, or _______ were moving.
15. wrapping the wire into a coil around the magnet ____________ the current.
16. when there is relative motion between the wire and a nearby magnet, we have created an ____________ current.
17. this connection between magnetism and electricity was used to develop ____________, ____________, and other electrical technology.
what’s in a generator?
18. define ac –
19. one advantage about using ac is that it is relatively easy to ____________ (for long distances) or ____________ (for consumer use) the voltage of alternating current.
20. generators that produce alternating current are called ____________.

Question

Accepted Answer

### Question 14
# Brief Explanations:
This question is about the conditions for electric current flow in a circuit related to magnetism and motion. From electromagnetic induction concepts, current flows when there's relative motion between the wire, magnet, or charge carriers (electrons). So the blanks relate to the moving elements: wire, magnet, electrons (charge carriers).
# Answer:
wire, magnet, electrons (charge carriers)

### Question 15
# Brief Explanations:
Wrapping wire into a coil around a magnet (solenoid - like setup) in the context of electromagnetic induction: a coil increases the magnetic field interaction, which in turn affects (increases) the induced current due to more turns (more flux change interaction). So the action is to increase the current.
# Answer:
increases

### Question 16
# Brief Explanations:
When there's relative motion between a wire and a magnet, the phenomenon is electromagnetic induction, which creates an induced electric current. So the type of current is induced.
# Answer:
induced

### Question 17
# Brief Explanations:
The connection between magnetism and electricity (electromagnetic induction) was used to develop devices like generators (produce electricity from motion) and motors (use electricity to create motion), along with other electrical tech. So the two main devices are generators and motors.
# Answer:
generators, motors

### Question 18
# Brief Explanations:
AC stands for Alternating Current. By definition, Alternating Current is an electric current in which the direction of the current (and thus the voltage) periodically reverses direction, as opposed to Direct Current (DC) which flows in one direction.
# Answer:
Alternating Current (AC) is an electric current in which the direction of the current (and the voltage) periodically reverses direction, typically in a sinusoidal or cyclic manner.

### Question 19
# Brief Explanations:
For AC, transformers are used to change voltage. For long - distance transmission, we need to increase (step - up) voltage to reduce power loss ($P = I^{2}R$, higher voltage means lower current for same power). For consumer use, we need to decrease (step - down) voltage to safe and usable levels (e.g., from high - tension lines to household 120/240V). So the blanks are "increase (step - up)" and "decrease (step - down)".
# Answer:
increase (step - up), decrease (step - down)

### Question 20
# Brief Explanations:
Generators that produce Alternating Current are specifically called Alternators. These generators use electromagnetic induction where the coil or magnet rotates, producing a current that alternates in direction (AC).
# Answer:
alternators

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Question 14

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Question 15