Download The circuits and magnetism game

Lots of fun!
Win valuable prizes!
1. Which one of the following circuits has the largest
resistance?
2V
20 V
10 V
8V
2V
2. When two light bulbs are connected in series, the
A. same amount of current always flows through each
bulb.
B. current through each light bulb is proportional to the
resistance of the bulb.
C. neither A nor B
3. Compared to the resistance of two resistors
connected in series, the same two resistors
connected in parallel have
A. less resistance.
B. the same resistance.
C. more resistance.
4. When one light bulb in a series circuit containing
several light bulbs burns out
A. nothing changes in the rest of the circuit.
B. the other light bulbs burn brighter.
C. none of the other bulbs will light up.
5. Surrounding every moving electron is
A. an electric field.
B. a magnetic field.
C. both A and B
D. none of the above
6. If you break a bar magnet in half, each half
A. becomes a bar magnet with two poles.
B. becomes unmagnetized.
C. contains one magnetic pole.
7. Magnetic field strength is
A. strongest close to a magnet.
B. constant everywhere around a magnet.
C. strongest far from a magnet.
8. Magnetic fields are produced by
A. moving particles.
B. moving particles of earth.
C. moving charged particles.
D. charges at rest.
E. none of the above
9. Magnetic field lines surrounding a magnet are
conventionally drawn
A. from north to south.
B. from south to north.
C. either way.
10. Moving electric charges will interact with
A. an electric field.
B. a magnetic field.
C. both A and B
D. none of the above
11. Loops of wire in a motor rotate because a
A. magnet attracts stationary electrons in the wire.
B. current exerts a force on the loop, causing it to rotate.
C. magnetic field exerts forces on moving electrons in the
loop.
D. battery effectively pushes a loop around in the field.
E. none of the above
12.Which geographic pole of the earth is nearest the
magnetic north pole of the earth?
A. South Pole
B. North Pole
C. both A and B
13. Electric current can best be induced in a wire by
A. moving a magnet up and down near the wire.
B. rotating the wire.
C. stretching the wire.
D. setting the wire near a magnet.
E. none of the above
14. A magnet is moved in and out of a coil of wire
connected to a voltmeter. If the number of coils
doubles, the induced voltage
A. halves.
B. is the same.
C. doubles.
D. quadruples.
E. none of the above
15. A magnet is moved in and out of a coil of wire
connected to several lamps. If the number of turns
in the coil is doubled
A. it is harder to move the magnet.
B. it is easier to move the magnet.
C. there is no difference in moving the magnet.
16. A device consisting of a coil that is mechanically
rotated in a stationary magnetic field is called
A. a generator.
B. a motor.
C. a magnetic pole.
D. a dipole.
E. a transformer.
17. The magnetic field strength inside a currentcarrying coil will be greater if the coil encloses a
A. iron rod.
B. vacuum.
C. glass rod.
D. wooden rod.
E. none of the above
18. A device that transforms electrical energy to
mechanical energy is a
A. magnet.
B. generator.
C. transformer.
D. motor.
E. none of the above
19. If a magnet is pushed into a coil, voltage is
induced across the coil. If the same magnet is
pushed into a coil with a greater speed
A. the same voltage is induced.
B. a smaller voltage is induced.
C. a larger voltage is induced.
20. A device that uses two coils around an iron core
to change the voltage across a circuit is called a
A. diode.
B. voltmeter.
C. generator.
D. motor.
E. transformer.
21. A transformer works because
A. electricity is transferred to a coil via an iron core.
B. a changing magnetic field is transferred to a coil via an
iron core.
C. electricity is induced in a rotating coil.
D. electricity flows from a primary coil to a secondary
coil.
22. To reduce the amount of energy lost as heat in
power lines, electric energy is transmitted from
power plants to consumers
A. as alternating current at low voltage.
B. as alternating current at high voltage.
C. as direct current at low voltage.
D. as direct current at high voltage.
23. In the diagram below, a magnetic field is directed
toward the left. A negatively charged particle moves in
the direction of the dashed arrow. What is the
direction of the magnetic force acting on the particle?
A. to the right
B. upward
C. to the left
D. downward
E. into the page
F. out of the page
-
Bonus question time
 After your team learns its score, you may wager any
amount of points up to your total. Submit your wagers
on a slip of paper to Mr. Maley.
Bonus question
 The voltage across a transformer primary coil that has
200 turns is 120 V. What is the voltage across the
secondary coil, which has 40 turns?
Answer:
 24 V