SI Units 1.1

These flashcards cover key concepts about expressing quantities and SI units in Physics as outlined in the Edexcel GCSE syllabus.

What are the SI Base Units used in Physics?

The SI Base Units are the foundation for all other units in physics, which include meter, kilogram, second, ampere, kelvin, mole, and candela.

What is the unit of force and its symbol?

The unit of force is Newton, symbolized as N.

How is 1 hour converted to seconds?

1 hour is converted to seconds by multiplying by 3600.

What is the relationship between Kelvin and degrees Celsius?

To convert Kelvin to Celsius, subtract 273.15; to convert Celsius to Kelvin, add 273.15.

What are significant figures?

Significant figures are the digits in a number that contribute to its value, including all non-zero digits and any zeros between them.

How are large and small numbers expressed in standard form?

In standard form, numbers are expressed as a × 10^n, where 'a' is a number between 1 and 10, and 'n' indicates the power of ten.

What does the prefix 'kilo-' represent in terms of units?

The prefix 'kilo-' represents a factor of 10^3 or 1000.

How do you round to 2 significant figures?

To round to 2 significant figures, identify the second significant digit and look at the digit following it; round up if it's 5 or greater.

What is the SI unit for pressure?

The SI unit for pressure is Pascal, symbolized as Pa.

What is a common conversion between kilometers and meters?

1 kilometer is equal to 1000 meters.

What is the conversion factor for converting seconds to hours?

To convert seconds to hours, divide by 3600.

What is the significance of trailing zeros in significant figures?

Trailing zeros after a decimal point are considered significant, while trailing zeros without a decimal point are not.

How do you express the number 143,000,000 in standard form?

In standard form, 143,000,000 is expressed as 1.43 x 10^8.

What are the common prefixes for multiples in SI Units?

Common prefixes include milli, centi, deci, kilo, mega and giga.

What is the SI Base Quantity for electric current?

The SI Base Quantity for electric current is the ampere, symbolized as A.