Topic 3

Question 1

1 ha

Answer 1

10 000m2

Question 2

1L

Answer 2

1000 cm3

Question 3

1t

Answer 3

1000kg

Question 4

converting metric

Answer 4

x1000, x100, x10 or divide

Question 5

converting area and volume

Answer 5

times or divide by the large number as well as the power

Question 6

precision or limit of reading

Answer 6

The smallest unit on a measuring instrument

Question 7

accuracy of a measurement

Answer 7

restricted to plus or minus half of the precision (±1/2).

Question 8

upper and lower bounds

Answer 8

The smallest and largest values between which the actual measurement lies

Question 9

Absolute error

Answer 9

the difference between the actual value and the measured value.

Question 10

Relative Error

Answer 10

gives an idea as to how close the measurement is.
= absolute error/ measurement

Question 11

percentage error

Answer 11

relative error, as a percentage.
= absolute error/ measurement x100

Question 12

what is energy measured by?

Answer 12

watts (W), joules (J) or calories

Question 13

1 kilocalorie

Answer 13

approximately 4.184 kilojoules.

Question 14

kilowatt

Answer 14

1000 watts.

Question 15

kilowatt-hour (kWh)

Answer 15

represents the amount of electrical energy when a 1000 W power load is drawn for 1 hour

Question 16

energy rating

Answer 16

Running cost of the appliance = energy consumption figure x electricity price rate.