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Quick Quiz
1. State the principle of conservation of energy.
2. What energy change takes place when an object falls?
3. A skateboarder slows down when rolling along flat
ground. What happens to the kinetic energy of the
boarder?
4. The chemical energy in a battery is changed into kinetic
by an electric motor. Why is the motor not 100%
efficient?
5. Define power?
6. State three types of renewable energy?
7. State a disadvantage of solar power.
8. State an advantage of wind power.
9. Name three fossil fuels.
10. Why is oil non-renewable?
11. What can a transformer do to an a.c. voltage?
12. What type of field exists around a current carrying wire?
13. Name the particles found in the nucleus of an atom.
14. Describe the difference between a.c. and d.c. electricity.
15. What is measured in coulombs?
16. What can accelerate a charged particle?
17. What is potential difference or voltage?
18. What single meter can measure resistance?
19. Do electric field lines travel towards or away from a
positive charge?
20. Describe the shape of graph produced by Ohm’s Law.
21. What is constant in Ohm’s Law?
22. In a graph of voltage against current what is the
gradient equal to?
23. The resistance of a lamp varies with current. Why does
it do this?
24. How does a thermistor’s resistance change as the
temperature increases?
25. What is true about the current in a series circuit?
26. In what type of circuit is the voltage constant across all
components?
27. When we increase the resistance of a variable resistor a
lamp dims. Why does it dim?
28. What advantage is there in connecting appliances in
parallel?
29. State an advantage of using a ring circuit.
30. Name three input devices.
31. State the energy change in a loudspeaker.
32. Why is it important to connect an LED the right way
round?
33. Why is there usually a series resistor connected to an
LED?
34. Name an input device that converts light energy into
electrical energy?
35. Which component has a lower resistance when
exposed to light?
36. What type of transistor will switch on when +2 V are
applied to the gate?
37. What is the switch on voltage of an NPN transistor?
38. What type of transistor has a terminal called a drain?
39. What energy change takes place in a resistor?
40. What common unit is equivalent to one joule per
second?
41. What are the units of specific heat capacity?
42. What is likely to contain more heat energy: a burning
match or a hot cup of coffee?
43. When an ice cube melts does it give out or take in
heat?
44. Which change of state involves specific latent heat of
fusion?
45. Why does steam at 100 degrees celcius produce a more
serious burn to skin than the same mass of water at
100 degrees celcius?
46. Explain how snow shoes work?
47. Explain how you can lay down on a bed of nails and not
be injured?
48. In a bicycle pump what happens to the pressure as the
volume decreases?
49. What is absolute zero?
50. Explain why a gas container might explode if thrown
into a fire?
Answers
1. Energy cannot be created or destroyed, it just changes
form.
2. Potential  Kinetic
3. The force of friction converts kinetic energy into heat.
4. Resistance in the wires converts electrical into heat.
5. Energy per unit time
6. Wind, waves, solar, geothermal, hydro, biomass, tidal
7. It only works in sunshine. Needs a large area to produce a
modest amount of energy.
8. No CO2 is produced. No pollution. Inexpensive
9. Coal, oil and gas
10. It takes millions of years to form.
11. The size of voltage
12. Magnetic
13. Protons and neutrons
14. D.C. only flows in one direction. A.C. flows back and forth.
15. Charge (Q)
16. An electric field
17. The energy per unit charge
18. Ohmmeter
19. Away from positive
20. Straight line through the origin
21. Resistance
22. Resistance
23. As temperature increases resistance also increases.
24. TURD Temperature Up Resistance Down
25. It stays the same at all points.
26 Parallel
27. As resistance increases the current decreases and the
lamp dims.
28. They can switch on and off individually.
29. Thinner wire can be used.
30. Microphone, solar cell, switch, variable resistor,
thermocouple, thermistor, LDR
31. Electrical  sound
32. It only conducts in one direction.
33. To protect it from too much current flowing through it.
34. Solar cell
35. LDR
36. n channel enhancement MOSFET
37. +0.7 V
38. n channel enhancement MOSFET
39. Electrical  Heat
40. watts
41. J kg-1 ⁰C-1
42. A mug of hot coffee
43. Takes in heat
44. Melting or freezing. Solid   Liquid
45. Steam, it contains latent heat of vaporisation.
46. Large surface area reduces the pressure on the snow.
47. Lots of nails increase the surface area reducing the
pressure on the skin.
48. Pressure increases
49. The lowest temperature possible. No heat energy left.
-273 ⁰C, 0 K
50. Increasing temperature increases the speed and kinetic
energy of the particles. They strike the walls more often
and with greater force increasing the pressure.