Grade 11 · Science · Physics

11th grade Power worksheet

6 printable versionsBuilding Confidence10 questions · answer keyFree · no account

Level: Building Confidence · On Level · Challenge Me

When it’s done, scan the sheet with your phone and PencilGo marks it and picks the next one. Create a free account

Version

Power

Grade 11 Science Worksheet - Building Confidence

NameDate

Circle the best answer, or write your answer on the line.

Only 35% of the power a winch draws goes into lifting. It raises a 5 kg crate 4 m in 4 s at steady speed. What power does it draw, Ari?
Only 60% of the power a winch draws goes into lifting. It raises a 3 kg crate 5 m in 5 s at steady speed. What power does it draw, Bo?
3.
In the work-time graph, what is the motor's power during the first 4 s, Jun?
- 60 W
- 240 W, the work at 4 s
- 960 W, the work times the time
4.
In the work-time graph, what is the motor's average power over all 10 s, Luz?
Use the picture in question 3.
- 30 W
- 35 W, the mean of the two slopes
- 10 W, the final slope
5.
A 1.2 kW toaster oven runs for 25 minutes. How much energy does it use, Milo?
- 30 kWh
- 0.048 kWh
- 1.2 kWh
- 0.5 kWh
6.
A 60 W bulb and a 9 W LED give the same light. Both run 5 h a day. How much energy does the LED save each day, Noah?
- 300 Wh
- 255 Wh
- 51 Wh
- 45 Wh
7.
A 2,000 W kettle runs for 3 minutes. How many joules does it use, Pia?
- 360 J
- 360,000 J
- 6,000 J
- 100 J
Read this first
Machine tests (example data)
Machine Work done (kJ) Time (s)
A 0.9 6
B 2.4 20
C 0.3 3
D 1.6 8
8.
Using the table, which machine has the most power, Ren?
- Machine A, at 150 W
- Machine B, which does the most work
- Machine D, at 200 W
- Machine C, which takes the least time
9.
Machine B keeps its power steady for 5 minutes. How much work does it do, Tala?
- 720 kJ
- 36 kJ
- 0.6 kJ
- 12 kJ
10.
How many times the power of machine C is machine D's, Zee?
- 2.7 times
- 2 times
- 5.3 times
- 0.5 times

Power. Every version has 10 questions, and the answer key prints on the second page.

I can find power as work ÷ time, P = W ÷ t, in watts (1 W = 1 J/s), and move between W, kW, J, kJ, s, minutes and kWh.
I can find the power a machine draws from the power it delivers and its efficiency, and the power a lift needs on a slope with friction.
I can use P = Fv at a steady speed, and say how power grows when speed, load or height changes.
I can read power as the slope of a work-time graph and energy as the area under a power-time graph, and judge claims about power.

Standard: none (TX, FL)

power: How fast work is done: joules each second

watt (W): One joule each second

kilowatt (kW): 1000 watts

steady speed: Speed that doesn't change, so no energy goes into speeding up

slope: Rise ÷ run on a graph; on a work-time graph, the power

efficiency: Share of the power a machine draws that becomes useful work

kilowatt-hour (kWh): Energy used by 1 kW running for 1 hour: 3.6 million J

area under a graph: On a power-time graph, the area is the energy delivered

Your child used the useful power and skipped the efficiency. A machine that wastes energy must draw more power than it delivers.

Your child multiplied by the efficiency instead of dividing. A motor always draws more power than it delivers.

Your child counted only the lift up the slope. The motor also works against friction over the same distance.

What is the most common mistake with power?

Your child used the useful power and skipped the efficiency. A machine that wastes energy must draw more power than it delivers.

Are these 11th grade science worksheets free to print?

Yes. All 6 printable versions at each level are free to print, with the answer key, and no account is needed.

Every sheet you scan goes into your child’s record: dated, marked and ready for the year-end portfolio. Homeschool records