Current Of Electricity

Question 1

Current, I

Answer 1

The rate of flow of electric charges through a given section of an electrical conductor. (SI unit: Ampere, A)
I=Q/t

Question 2

Convectional current flow

Answer 2

The direction in which positive charges flow

Question 3

Electron flow

Answer 3

The direction in which electrons flow

Question 4

Electromotive force, E

Answer 4

Work done by a source in driving a unit charge around a complete circuit. (SI unit: volt, V)
Emf is the energy converted from non-electrical forms to electrical forms per coulomb of charge.
E=W/Q

Question 5

Potential difference, V

Answer 5

Work done to drive a unit charge through a component. (SI unit: Volt, V)
Pd is the energy converted from electrical energy to other forms of energy
V=W/Q

Question 6

Why is there almost no current flowing through a voltmeter?

Answer 6

It is assumed to posses a very large amount of resistance

Question 7

Resistance,R

Answer 7

Ratio of potential difference across a component to the current flowing through it
R=V/I

Question 8

Ohm’s Law

Answer 8

The current flowing through a metallic conductor is directly proportional to the potential difference applied across its ends, provided that the physical conditions remain constant.