4.1 Charge and Current

Question 1

Define electric current

Answer 1

The rate of flow of charge

Question 2

How do we measure current?

Answer 2

Place an ammeter in series.

Question 3

Define 1 Coulomb

Answer 3

The flow of charge in a time of 1 second when the current is 1 ampere.

Question 4

What are electrolytes?

Answer 4

A liquid that can conduct a charge.

Question 5

Anode

Answer 5

Positive electrode.

Question 6

Cathode

Answer 6

Negative electrode

Question 7

Anion

Answer 7

Negative ion

Question 8

Cation

Answer 8

Positive ion

Question 9

An anode and cathode are placed in an ionic solution. What happens?

Answer 9

A current flows.

Question 10

Conventional current VS electron flow

Answer 10

Conventional current: Positive to negative
Electron flow: Negative to positive

Question 11

Kirchoff’s first law

Answer 11

For any point in an electrical circuit, the sum of the currents into that point is equal to the sum of the currents coming out of that point.

Question 12

What law is a consequence of the conservation of charge?

Answer 12

Kirchoff’s first law.

Question 13

Define mean drift velocity

Answer 13

The average velocity of the electrons as they travel down the wire, colliding with positive metal ions.

Question 14

Mean drift velocity equation

Answer 14

I = Anev