Formula and equations

Question 1

Answer 1

P = 100 watts

voltage = 12 volts

I = P/V 100/12 = 8.3

Current = 8.3 amps

Question 2

Answer 2

Radius = 40 cm

Height = 100 cm

V = 3r²h / 1000

V = 480 litres

Question 3

Answer 3

Check units are the same, convert if not.

Radius = 4cm

Depth = Height = 9cm

π = 3

1/3 x π x r² x d

Volume = 150 cm³