Expressing Quantities & SI Units (Edexcel GCSE Physics): Flashcards
Exam code: 1PH0
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Define SI units.
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Cards in this collection (14)
Define SI units.
SI units are the standard set of base units (e.g. kilogram, metre, second, ampere, kelvin, mole) from which every other physics unit is derived.
Define a unit prefix.
A prefix is a symbol placed before a unit to represent a power of ten, e.g. kilo (k) represents ×10³.
What is the SI base unit for electric current?
The ampere (A).
State the derived SI unit for force, including its base-unit equivalent.
The newton (N), equivalent to kg m/s².
Which prefix represents 10⁻⁶ and what is its symbol?
Micro, symbol μ.
The prefix kilo represents a power of ten of ______.
The prefix kilo represents a power of ten of 10³.
True or False?
The prefix milli represents a larger power of ten than centi.
False.
Milli (10⁻³) is smaller than centi (10⁻²) — centi is ten times larger.
How many seconds are there in 1 hour?
3600 s (60 × 60).
How do you convert a temperature from degrees Celsius to kelvin?
Add 273.15 to the Celsius value.
Define significant figures.
Significant figures are the digits in a number that contribute to its value, used to show the precision of a measurement.
How many significant figures does 0.0120 have?
Three — the leading zeros are not significant, but the trailing zero after the decimal point is.
Define standard form.
Standard form is a way of writing very large or very small numbers as a × 10ⁿ, where a is between 1 and 10.
In standard form (a × 10ⁿ), the value of a must be between 1 and ______.
In standard form (a × 10ⁿ), the value of a must be between 1 and 10.
True or False?
When converting hours to seconds, you should divide by 3600.
False.
To convert hours to seconds, you multiply by 3600; dividing converts seconds back into hours.
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