Current of electricity

Question 1

Define electric current

Answer 1

Electric current is the rate of flow of electric charges

Question 2

Define conventional current

Answer 2

Conventional current is the flow of positive charges from the positive to the negative terminal

Question 2

Define Ohm’s Law

Answer 2

Ohm’s Law states that current passing through a metallic conductor is directly proportional to the potential difference across it, provided that physical conditions like temperature remain constant

Question 2

Define electron flow

Answer 2

Electron flow is the flow of electrons from the negative to the positive terminal

Question 3

Define electromotive force

Answer 3

E.m.f. of an electrical source is the work done by the source in driving a unit charge around a complete circuit

Question 3

Define potential difference

Answer 3

Potential difference across a component is the work done to drive a unit charge through the component

Question 4

Define resistance

Answer 4

Resistance of a component is the ratio of the potential difference across it to the current flowing through it

Question 5

What are the factors affecting wire resistance

Answer 5

• Length
• Cross-sectional area
• Material
• Temperature

Question 6

What are conductors that obey Ohm’s Law known as

Answer 6

Ohmic conductors

Question 7

What is a semiconductor diode

Answer 7

• Allows electric current to flow in 1 direction only
• Only conducts current what it is forward-biased

Question 8

What is the use of a semiconductor diode

Answer 8

Convert from an alternating current to a direct current