Current And Voltage

Question 1

What is current?

Answer 1

The quantity of electricity flowing through a conductor.

Question 2

What is voltage?

Answer 2

The pressure of electricity flowing through a conductor.

Question 3

What holds electrons in orbit?

Answer 3

Force of attraction.

Question 4

What makes up a nucleus?

Answer 4

Protons and neutrons.

Question 5

Whats the relationship between protons neutrons and electrons in a balanced atom?

Answer 5

There will be an equal number of protons neutrons and electrons.

Question 6

What is the outer orbit of an atom knows as?

Answer 6

Valance shell.

Question 7

What is the electron in the outer orbit known as?

Answer 7

Valance electron.

Question 8

What causes current?

Answer 8

When outer electrons are forced out of orbit they will wander amongst other atoms. These electrons are called free electrons, and their movement from one atom to another produces current.

Question 9

What is the difference between conductors and insulators?

Answer 9

In conductors, very little energy is needed to force electrons out of their orbit. Therefore current flows easier.

In insulators, electrons are not dislodged as easily and very little to no current can flow.

Question 10

When an electron leaves an atom, what is this atom known as?

Answer 10

Positive ion.

Question 11

What are electrons attracted and repelled by?

Answer 11

Attracted by positive charge, repelled by negative charge.

Question 12

Which direction is flow?

Answer 12

Negative to positive.

Question 13

What is conventional current flow?

Answer 13

Flow from positive to negative. Believed to be true in the early days.

Question 14

What is the unit of measurement of current?

Answer 14

Ampere - A

Question 15

What is an amp?

Answer 15

The amount of electrons passing a given point in one second.

Question 16

What is one amp equal to?

Answer 16

6.241x10 to the power of 18.

Question 17

What is caused by current flow?

Answer 17

Heat and a magnetic field around the conductor.

Question 18

Whats the circuit symbol for current?

Answer 18

I

Question 19

When does potential diffence exist?

Answer 19

Between two points in a circuit with a difference in charge.

Question 20

What force drives a current around a circuit?

Answer 20

Electromotive force (EMF)

Question 21

Whats causes potential difference?

Answer 21

Inbalance of electrons at different points.

Question 22

Where are voltmeters and ammeters placed?

Answer 22

Voltmeter - outside circuit

Ammeter - inside circuit

Question 23

What are six methods which produce voltage?

Answer 23

Chemical
Friction
Induction
Pressure
Heat
Light

Question 24

What is the material in solar panels?

Answer 24

Semiconductor

Question 25

What is a thermocouple?

Answer 25

When two wires of different metals are welded at each end and the two ends brought to different temperatures. Electric potential is produced between them.

Question 26

What does the amount of voltage produced by a thermocouple dependent on?

Answer 26

The difference in temperature and the type of materials used.