Key concepts

Question 1

What are the derived Si units for 9 quantities?

Answer 1

• frequency= hertz = Hz
• force = Newtons = N
• energy = joule = J
• power = watt = W
• pressure = pascal = Pa
• electric charge = coulomb= C
• electric potential difference= volt = V
• electric resistance = ohm
• magnetic flux density = tesla = T

Question 2

What are the base Si units?

Answer 2

• length = metre = m
• mass = kilogram = kg
• time = seconds = s
• current = amp = A
• temperature = Kelvin = K
• amount of a substance = mole = mol