year 7 science: storing energy problem solving test...
TRANSCRIPT
Year 7 Science:Storing Energy
Problem Solving TestProblem Solving Test
Name:……………………………………… Date: ……………….
SkillSkill Red, Green Red, Green AmberAmber
Bar Graphs
Line graphs
Averages
Extracting Information
Drawing Conclusions
Storing Energy: Problem Solving Test
1. Some year 7 pupils compared the energy contained in each of their chocolate bars. Their teacher presented their findings in a table.
Chocolate Bar Energy (kJoules)
Mars Bar 550
Galaxy 325
Flyte 150
Wispa 200
Mars Bar Galaxy Flyte Wispa
Energy (kJoules)
Complete the bar graph below to present the pupils results.
2. An Year 7 class investigated the change in light intensity as they changed the distance between their light source (torch) and a solar cell. Their teacher presented their results in a table.
Distance (cm) Light Intensity (units)
0 40
5 10
10 4
15 2
20 1
Storing Energy: Problem Solving Test
40
30
20
10
50
Distance (cm)
Complete the line graph below to show the class’s results.
3. An year 7 pupil wanted to find out how much electricity she was using at home. She read the electricity meter. Twenty four hours later she read the meter again.
b) What was the average quantity she used per day.
Storing Energy: Problem Solving Test
kWh kWh
21474 42474
meter reading at start meter reading after 24 hours
a) Calculate the number of units of electricity she used in 24 hours.
kWh kWh
21474 83474
meter reading at start meter reading after 48 hours
She read the meter again the next day (after 48 hours).
Storing Energy: Problem Solving Test
Traditional windmills use the power of the wind to turn mill stones and drive water pumps. Modern wind turbines also use the power of the wind. However, a modern wind turbine turns a generator which produces electricity.
The electricity produced by the turbines goes into the National Grid. The National Grid then carries the electricity to homes and industries throughout Britain.
Although wind speeds are always changing, there is usually enough wind to operate the turbine for 70% of the time. A wind turbine is designed to last for about 20 years.
A 600 kW wind turbine can supply the electricity needed for 400 households.
4. Read the passage below
a) What happens to electricity after it goes into the National Grid?
……………………………………………………………………………………
…………………………………………
……………………………………………………………………………………
………………………………………….
b) How many households can a 600 kW wind turbine supply?
……………………………………………………………………………………
………………………………………….
5. An year 7 class investigated the number of caddis fly larvae living in the River Clyde.
The pupils counted the number of fly larvae in water samples taken from different points along the river and measured the speed of the river at each point.
Their teacher presented their results in a table.
Storing Energy: Problem Solving Test
Speed of river (cm/s) 50
100
150
200
250
Number of caddis fly larvae
15
20 50 70 80
a) What conclusion can you make about the speed of the river and the number of caddis fly larvae? *HINT: What happens when the river speed increases?