Work done, power and energy costs
9th grade (Year 10 in England) · 16 questions · Common Core: NGSS.HS-PS3-1, NGSS.HS-PS3-3 · England: KS3 Physics: Energy (calculation of fuel uses and costs), KS4 Combined Science: Energy
Name
Date
Score/ 16
Question 1
An appliance transfers 150 J of energy in 30 s. What is its power, in watts?
AnswerW
Question 2
A 1 kW heater is used for 3 hours. Electricity costs 30 cents (pence) per kWh. How much does it cost to run, in cents (pence)?
Answer
Question 3
A force of 50 N pushes a box 3 m along the floor. How much work is done, in J?
AnswerJ
Question 4
An appliance transfers 20000 J of energy in 10 s. What is its power, in watts?
AnswerW
Question 5
A 3 kW heater is used for 10 hours. Electricity costs 15 cents (pence) per kWh. How much does it cost to run, in cents (pence)?
Answer
Question 6
A force of 150 N pushes a box 2 m along the floor. How much work is done, in J?
AnswerJ
Question 7
An appliance transfers 500 J of energy in 5 s. What is its power, in watts?
AnswerW
Question 8
A 0.1 kW heater is used for 5 hours. Electricity costs 25 cents (pence) per kWh. How much does it cost to run, in cents (pence)?
Answer
Question 9
A force of 10 N pushes a box 3 m along the floor. How much work is done, in J?
AnswerJ
Question 10
An appliance transfers 600 J of energy in 10 s. What is its power, in watts?
AnswerW
Question 11
A 1 kW heater is used for 4 hours. Electricity costs 25 cents (pence) per kWh. How much does it cost to run, in cents (pence)?
Answer
Question 12
A force of 150 N pushes a box 2 m along the floor. How much work is done, in J?
AnswerJ
Question 13
An appliance transfers 20000 J of energy in 10 s. What is its power, in watts?
AnswerW
Question 14
A 3 kW heater is used for 2 hours. Electricity costs 15 cents (pence) per kWh. How much does it cost to run, in cents (pence)?
Answer
Question 15
A force of 250 N pushes a box 40 m along the floor. How much work is done, in J?
AnswerJ
Question 16
An appliance transfers 6000 J of energy in 60 s. What is its power, in watts?
AnswerW
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