Lesson 4.7.3.2
4.7.3.2 Uses of the generator effect (HT only) Quiz: AQA Physics, Unit 7
20 questions
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Lesson 4.7.3.2, Uses of the generator effect (HT only): 20 multiple choice questions for the AQA GCSE Physics (8463), Unit 7: Magnetism and electromagnetism, written with Revision Ninja.
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The 20 questions
-
What type of electrical current does a standard alternator generate?
- Direct current
- Induced charge
- Alternating current
- Static current
-
(Higher tier) Which generator produces a current that keeps one direction?
- A transformer
- An alternator
- A loudspeaker
- A dynamo
-
(Higher tier) Which device uses the generator effect to generate AC?
- A loudspeaker
- An alternator
- A relay
- A motor
-
What shape is the potential difference against time graph for an alternator?
- Sine wave
- Exponential curve
- Step function
- Straight line
-
Which side of zero does the potential difference output of a dynamo stay?
- Both sides
- Alternating sides
- One side
- Zero only
-
What defines the flow direction of direct current?
- Alternating directions
- One direction
- Random directions
- Zero flow
-
Which property of an alternator's output reverses regularly?
- Rotation speed
- Magnetic flux
- Current direction
- Peak amplitude
-
What action induces a current when a coil rotates in a magnetic field?
- Changing field
- Zero field
- Uniform flux
- Constant field
-
What factor directly determines the frequency of an alternator's output?
- Rotation speed
- Wire length
- Core temperature
- Coil mass
-
Why does an alternator's output potential difference change its sign?
- Speed decreases
- Magnets disappear
- Resistance drops
- Coil sides alternate
-
(Higher tier) Which device would you use to produce alternating current from a spinning turbine?
- A loudspeaker
- An alternator
- A dynamo
- A relay
-
Which change increases the peak potential difference of an alternator?
- Shortening wire
- Increasing speed
- Removing core
- Decreasing speed
-
What does the graph of a steady 6 V DC dynamo output look like?
- Sine wave
- Downward curve
- Upward slope
- Horizontal line
-
Which action reverses the output current direction of a dynamo?
- Adding turns
- Widening coils
- Reversing rotation
- Doubling speed
-
What primary energy conversion does the generator effect perform?
- Chemical to thermal
- Kinetic to electrical
- Light to electrical
- Electrical to kinetic
-
(Higher tier) An alternator spins at 50 cycles per second. What is its frequency?
- 50 kHz
- 50 Hz
- 0.02 Hz
- 5 Hz
-
How does a dynamo's output differ from an alternator's output?
- Stays unidirectional
- Zero voltage
- Infinite frequency
- Always alternating
-
What physical quantity is plotted on the y-axis of a generator graph?
- Current frequency
- Time
- Potential difference
- Resistance
-
If an alternator's rotation speed doubles, what happens to its period?
- It halves
- It stays same
- It doubles
- It quadruples
-
What type of electrical current does a standard working dynamo produce?
- Alternating current
- Static charge
- Direct current
- Induced voltage
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