Measurement and Energy Flashcards
1
Q
What is the ‘accuracy’ of a device?
A
The smallest unit it can measure to.
For example, the accuracy of a ruler with mm markings is 1 mm.
2
Q
How do you calculate relative error?
A
Relative error = absolute error / measurement
3
Q
Lower boundary formula
A
Lower boundary = measurement – absolute error
4
Q
Upper boundary formula
A
Upper boundary = measurement + absolute error
5
Q
1 Cal =
kj
A
4.184 kJ
6
Q
Define
Energy
A
the capacity of something to do work
7
Q
What is a Watt?
A
A rate of 1J/sec
8
Q
Define
Watt-hours (Wh)
A
How much power the device uses compared to the length of time the device is in use.
