Lesson 6.2.3.1
6.2.3.1 Direct and alternating potential difference Quiz: AQA Combined Science, Unit 19
20 questions
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Lesson 6.2.3.1, Direct and alternating potential difference: 20 multiple choice questions for the AQA GCSE Combined Science (8464), Unit 19: Electricity, written with Revision Ninja.
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The 20 questions
-
Which feature defines an alternating potential difference supply?
- Flows one way only
- Decreases to zero
- Constant magnitude value
- Reverses direction repeatedly
-
Which electrical supply is described as direct potential difference?
- Constantly zero
- Keeps same direction
- Constantly oscillating
- Reversing every cycle
-
What is the frequency of the UK domestic electricity supply?
- 230 Hz
- 5 Hz
- 60 Hz
- 50 Hz
-
Roughly what potential difference does the UK domestic mains supply provide?
- About 230 V
- About 110 V
- About 400 V
- About 12 V
-
What waveform is produced by the UK mains electricity supply on an oscilloscope?
- Alternating wave
- Flat straight line
- Exponential decay curve
- Stepped DC pulse
-
Which common device is powered by a direct potential difference supply?
- Wall socket toaster
- Desktop microwave
- Battery torch
- Mains kettle
-
What does a frequency of 50 Hz mean for the UK mains supply?
- 50 cycles per second
- 50 volts per second
- 50 waves per minute
- 50 amps per circuit
-
How many times each second does the current reverse in a 50 Hz ac supply?
- 100 times
- 25 times
- 200 times
- 50 times
-
A 50 Hz supply is switched on for 4 seconds. How many complete cycles occur?
- 200
- 400
- 50
- 12.5
-
A signal completes 100 full cycles in 2 seconds. What is its frequency?
- 50 Hz
- 2 Hz
- 200 Hz
- 25 Hz
-
An oscilloscope trace of a 50 Hz supply shows one full wave. How long does that wave take?
- 0.5 s
- 0.2 s
- 0.002 s
- 0.02 s
-
Which trace on an oscilloscope best represents a direct potential difference?
- A square wave
- A flat line
- A rising ramp
- A sine wave
-
What key difference distinguishes an ac supply from a dc supply?
- Voltage is higher
- Frequency is zero
- Direction changes repeatedly
- Current is lower
-
A power supply has a frequency of 0 Hz. What type of supply is it?
- Inductive supply
- Alternating current
- Transient supply
- Direct current
-
A supply alternates 60 times per second. What is the period of one full cycle?
- About 0.017 s
- About 60 s
- About 0.17 s
- About 0.6 s
-
What is the average value of an alternating potential difference over one complete cycle?
- Zero
- 50 V
- 325 V
- 230 V
-
What feature on an oscilloscope trace shows that a supply is alternating?
- Is perfectly straight
- Stays above zero
- Has constant height
- Crosses time axis
-
An ac supply has a frequency of 50 Hz. How long do 10 complete cycles take?
- 2 s
- 0.2 s
- 5 s
- 0.5 s
-
A 50 Hz ac supply is displayed on an oscilloscope. How many times per second does the trace cross zero?
- 50
- 25
- 200
- 100
-
Which electrical source provides an alternating current supply in the UK?
- Torch cell
- Mains socket
- Solar panel
- Car battery
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