Power of Components

Question 1

what does a pd of 10V tell us in a circuit

Answer 1

10 joules of energy is transferred per coulomb of charge

Question 2

what does the current of 1 ampere tell u?

Answer 2

1 coulomb of charge is flowing every second

Question 3

if we know the total of the pd across a component and the current flowing through it we can calculate the power of the component
what equation do we use to calculate power in a circuit

Answer 3

P= V x I 
power(W) = pd(V) x current(A)

Question 4

calculate the power of the resistor

the pd across the resistor is 50V and the current measured by the ammeter measures 0.2A

Answer 4

power = 10W

power (W) = V x I
power(W)= 0.2A x 50V

Question 5

in a circuit we have 
a cell with a pd of 20V across it
a current of 0.5A
2 resistors in series
one of the resistors has a pd of 15V
calculate the power of resistor A

Answer 5

power = 2.5W

total pd =20V 
pd of resistor B =15V
20V-15V=5V
power = V x I
resistor B = 5V
5V x 0.5A= 2.5W

Question 6

what is the equation used to calculate the power when u have the current and resistance?

Answer 6

P(W) =I^2(A) x R(Ω)

Question 7

calculate the power of the resistor
resistor has a resistance of 50 Ω
there’s a current of 0.4A

Answer 7

power=8W

Power(W) = I squared x R(Ω)
Power(W) = 0.4A squared x 50 Ω