Comb Sci: Energy 4

​Watch this video (2 mins)

​Make sure to understand:

• ​What is power?

• ​What is the formula for power?

Multiple Choice

Is the amount of energy being transferred over a period of time.

• Power
• Energy
• Seconds
• Joules

​Watch this video (2 mins)

​Make sure to understand:

• ​What is the unit for power?

Multiple Choice

What is the unit of measurement for power?

• Joules
• Watts
• Voltage
• Calories

Multiple Choice

1 kW (one kilowatt) is equal to...

• 10 W

• 100 W

• 1000 W

• 1,000,000 W

Multiple Choice

1 MW (one megawatt) is equal to...

• 10 W

• 100 W

• 1000 W

• 1,000,000 W

​Watch this video (2 mins)

​Make sure to understand:

• ​How to calculate power?

• ​How to calculate weight from mass.

Multiple Choice

A kettle transfers 1000J of energy every 2 seconds. Calculate its power.

• 2000 Watts
• 1000 Watts
• 500 Watts
• cannot be determined

Multiple Choice

How much power is generated by Ashley (50 kg) running up a 6 m flight of stairs in 5 seconds?

• 60 W

• 62 W

• 600 W

• 1500 W

​Watch this video (2 mins)

​Make sure to understand:

• ​How to calculate work done first, and then calculate power.

Multiple Choice

You move a 8 N object five meters in 4 seconds. How much power have you generated?

• 160 watts

• 10 watts

• 6.4 watts

• 17 watts

Multiple Choice

Two workers use 100 N of force to move a sofa 2 meters in 2 seconds. How much power is required?

• 100 watts

• 400 watts

• 104 watts

• 50 watts