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Edexcel GCSE Physics
Topic 10: Electricity and Circuits
10.3 Electrical Power and Energy
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Cards (156)
What is the formula to calculate electrical power using current and resistance?
P
=
P =
P
=
I
2
R
I^{2}R
I
2
R
What is the formula to calculate electrical energy using current, voltage, and time?
E
=
E =
E
=
I
V
t
IVt
I
V
t
The symbol for electrical power is
P
The formula
P
=
P =
P
=
I
V
IV
I
V
relates power to voltage and current
The electrical power formula
P
=
P =
P
=
I
2
R
I^{2}R
I
2
R
uses current and resistance to calculate power.
True
The symbol for electrical power is
P
In the formula
P
=
P =
P
=
V
×
I
V \times I
V
×
I
, the unit for voltage is volts
The formula
P
=
P =
P
=
I
2
R
I^{2} R
I
2
R
calculates power using current and resistance
The unit of electrical energy is the
joule
A 60-watt light bulb left on for 5 minutes consumes 18,000
joules
What is measured in watts?
Rate of energy conversion
How much electrical energy does a 100-watt light bulb consume in 30 minutes?
180,000 joules
What is the unit of electrical power?
Watt
What is the power consumed by a light bulb operating at 230V and drawing 0.5A?
115 watts
What is the formula to calculate power using current and resistance?
P
=
P =
P
=
I
2
R
I^{2} R
I
2
R
A device with a voltage of 120V and a resistance of 20 ohms consumes 720W
True
How much electrical energy does a 100-watt light bulb consume if left on for 30 minutes?
180,000 joules
A 100-watt light bulb left on for 30 minutes consumes
180,000 joules
of electrical energy.
True
What does power measure in electrical contexts?
Rate of energy conversion
What is the unit for voltage?
Volts (V)
What are the variables required to calculate electrical energy using
E
=
E =
E
=
I
2
R
t
I^{2} Rt
I
2
Rt
?
Current, resistance, time
Electrical power is the rate at which electrical energy is converted into other forms of energy.
True
A light bulb operating at 230V and 0.5A consumes
115 watts
of electrical power.
True
A hairdryer operating at 230V and 10A consumes 2300
watts
of power.
True
What is the unit of current?
Amperes (A)
The symbol for electrical power is
P
P
P
True
The symbol for resistance is
R
R
R
True
The unit of voltage is the ampere.
False
The formula to calculate electrical energy is
E
=
E =
E
=
P
t
Pt
Pt
True
A 100-watt light bulb left on for 30 minutes consumes
180,000 joules
of electrical energy.
True
A device operating at 120V and 2A for 5 minutes consumes 72,000
joules
of electrical energy.
True
What is the unit of voltage in the formula
E
=
E =
E
=
I
V
t
IVt
I
V
t
?
Volts
A device operates at 120V and draws 2A for 5 minutes. What is the electrical energy consumed?
72,000 J
A device operating at 120V draws 2A for 5 minutes. How much electrical energy is consumed?
72,000 J
Electrical power can be calculated using the formula P = V^{2}/R</latex>.
True
Match the variable with its unit:
Power ↔️ Watts (W)
Energy ↔️ Joules (J)
What is the formula to calculate electrical power using voltage and current?
P = V × I</latex>
What is the power of a hairdryer operating at 230V and drawing 10A?
2300W
In the formula
P
=
P =
P
=
I
2
R
I^{2}R
I
2
R
, the resistance is measured in ohms
The unit of electrical power is the
watt
(W).
True
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