Material

Question 1

stress

Answer 1

The force applied per unit cross sectional area of the wire

Question 2

strain

Answer 2

The fractional increase in the original length of the wire

Question 3

Young modulus

Answer 3

• The stiffness of the material

- the ratio of stress to strain

Question 4

elastic limit

Answer 4

the value of stress beyond which an object will not return to its original dimensions.

Question 5

elastic potential energy

Answer 5

Energy stored in a stretched or compressed material.

Question 6

electric field

Answer 6

A region in which a charged body experiences a force.

Question 7

electric field strength

Answer 7

the force per unit positive charge at a point. Unit: V m−1 or N C−1.

Question 8

electric potential

Answer 8

the energy per unit charge due to a charged body’s position in an electric field

Question 9

Kirchhoff ’s first law

Answer 9

the sum of the currents entering any point (or junction) in a circuit is equal to the sum of the currents leaving that same point. is law represents the conservation of charge.

Question 10

Kirchhoff ’s second law

Answer 10

the sum of the e.m.f.s round a closed loop in a circuit is equal to the sum of the p.d.s in that same loop.