Module 2.1 - Physical Quantites, Units and Measurements Flashcards by Kesegan Suthakar

Q

Prefix - T

A

Tera - x10^12

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Q

Prefix - G

A

Giga - x10^9

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Q

Prefix - M

A

Mega - x10^6

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Q

Prefix - K

A

Kilo - x10^3

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Q

Prefix - m

A

Milli - x10^-3

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Q

Prefix - µ

A

Micro - x10^-6

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Q

Prefix - n

A

Nano - x10^-9

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Q

Prefix - p

A

Pico - x10^-12

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Q

Prefix - d

A

Deci - x10^-1

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Q

Prefix - c

A

Centi - x10^-2

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Q

56µm?

A

= 56 x 10^-6 m

= 5.6 x 10^-5 m

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Q

3.2 x 10^10 Pa?

A

= 32 x 10^9 Pa

= 32 GPa

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Q

195 ns to ms?

A

= 195 x 10^-9 s

= 0.000195ms

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Q

SI unit for Acceleration?

A

ms^-2

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Q

SI unit for Density?

A

kg m^-3

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Q

SI unit for charge?

A

Coulombs - C

Q

SI unit for Energy?

A

Joules - J

Q

SI unit for Force?

A

N

Q

SI unit for Momentum?

A

kg ms^-1

Q

SI unit for p.d.?

A

V - Volts

Q

SI unit for Power?

A

W - Watts

Q

SI unit for Pressure?

A

Pascals - Pa

Q

SI unit for Velocity?

A

ms^-1

Q

What 3 things cause random errors?

A

> Small changes in the environment
Reading or recording values wrong
Unknown/Unpredictable changes to the experiment

Q

Example of random error?

A

Heating in circuits causing variations in current

Q

What 2 things cause systematic error?

A

> Faulty measuring instrument

> Instrument used incorrectly

Q

Examples of systematic error?

A

> Scale wrong on instrument

> Parallax error - not eye level when reading

Q

Define Accuracy

A

How close to the accepted/true value it is

Q

Define Precision

A

How close together repeat values are

Q

What is the absolute uncertainty?

A

The smallest division on an instrument

Q

How do you work out percentage uncertainty?

A

(Uncertainty ÷ Measured value) x 100