Revision

Question 1

;Accuracy

Answer 1

Closeness to true value
Resolution/Sensitivity

Question 2

Precision

Answer 2

Reliability of results

Question 3

Anomalies

Answer 3

A point that’s further to the range of data than the mean
range/2

Question 4

Systematic error

Answer 4

Same direction of uncertainty
Zero errors

Question 5

Rays

Answer 5

Will converge at the focal length if the 2 coming in are parallel

Question 6

Current

Answer 6

The rate of flow of charge

Question 7

Potential Difference

Answer 7

Energy transferred per coulomb when a charge passes through a component
V=W/Q

Question 8

EMF

Answer 8

Energy transferred per coulomb when a charge travels around the whole circuit

Question 9

Internal resistance

Answer 9

Small hidden resistance hidden inside a cell, that needs to be overcome to cause a current
V=emf - Ir

Question 10

Energy transferred

Answer 10

Work done
W=VIT

Question 11

Power

Answer 11

Rate of energy transfer
P=W/T

Question 12

Kirchhoff’s first law

Answer 12

Current
Current in = current out at any junction
Conservation of charge

Question 13

Kirchhoff’s second law

Answer 13

Voltage
In a loop, P.Ds sum to zero
Conservation of energy

Question 14

Resistivity

Answer 14

RA=LP

Question 15

Conductivity

Answer 15

GL=AS

Question 16

Temperature effect

Answer 16

Causes metal ions to vibrate faster so more collisions (reduces area)
Makes resistors more resistive

Question 17

Stiffness

Answer 17

Ability to change shape or resist bending

Question 18

Strentgh

Answer 18

Ability to withstand high stresses without breaking

Question 19

Toughness

Answer 19

The resistance of a material to breaking
Requires lots of energy to break it

Question 20

Hardness

Answer 20

The resistance of a material to scratching or denting

Question 21

Plasticity

Answer 21

Opposite of elasticity

Question 22

Stress

Answer 22

Force/Area

Question 23

Strain

Answer 23

Extension/ original length