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2_Principles of basic electrical circuits

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level 1
r.t.mathews
Quiz by r.t.mathews, updated more than 1 year ago More Less
Vito Martino
Created by Vito Martino about 9 years ago
r.t.mathews
Copied by r.t.mathews about 9 years ago
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Resource summary

Question 1

Question
3 x 12Ω resistors are connected in parallel to a 200V supply, calculate the total power of the circuit.
Answer
  • 10,000W
  • 400W
  • 1,000W
  • 1,111W

Question 2

Question
Two resistors of 20 ohms and 40 ohms are connected in series across a 120v d.c. supply, the current flowing in the circuit will be:
Answer
  • 20 A
  • 2 A
  • 5 A
  • 0.5 A

Question 3

Question
If three resistors are connected in series and have resistances of 20 Ω, 30 Ω, and 40 Ω then the total resistance would be
Answer
  • 100 Ω
  • 90 Ω
  • 70 Ω
  • 80 Ω

Question 4

Question
3 x 20Ω resistors are connected in series to a 200V supply, calculate the total power of the circuit.
Answer
  • 10 KW
  • 0.666 KW
  • 0.333 KW
  • 12 KW

Question 5

Question
For the circuit shown the total resistance is
Image:
Series_circuit_1 (image/jpg)
Answer
  • 10 Ω
  • 15 Ω
  • 100 Ω
  • 90 Ω

Question 6

Question
To measure the current through a load the meter must be connected
Answer
  • across the load
  • in parallel with the supply
  • in parallel with the load
  • In series with the load

Question 7

Question
To measure the voltage across a load the meter must be connected
Answer
  • before the load
  • in parallel with the supply
  • in parallel with the load
  • In series with the load

Question 8

Question
In the diagram below if I1 and I2 are ammeter readings then
Image:
Series_circuit_2 (image/jpg)
Answer
  • I2 will be greater than I1
  • I1 will be greater than I2
  • I1 will be equal to I2
  • I1 will be half I2

Question 9

Question
In the diagram below instrument A measures
Image:
Slide1.JPG (image/JPG)
Answer
  • the current through R3
  • the current through R1 and R2
  • the volt drop across R1 and R2
  • the volt drop across R1 and R3

Question 10

Question
In the diagram below instrument B measures
Image:
Slide1.JPG (image/JPG)
Answer
  • the current through R3
  • the current through R1
  • the volt drop across R1 and R2
  • the volt drop across R1

Question 11

Question
Instrument A measures
Image:
Slide2.JPG (image/JPG)
Answer
  • current through a resistor
  • supply current
  • Voltage across a resistor
  • supply voltage

Question 12

Question
Instrument E measures
Image:
Slide2.JPG (image/JPG)
Answer
  • current through a resistor
  • supply current
  • Voltage across a resistor
  • supply voltage

Question 13

Question
For the circuit shown above the total current is
Image:
Series_circuit_1 (image/jpg)
Answer
  • 0.1A
  • 10A
  • 20A
  • 1.1A

Question 14

Question
If four resistors each of 50 Ω are connected in parallel the overall resistance is
Answer
  • 25 Ω
  • 100 Ω
  • 12.5 Ω
  • 200 Ω

Question 15

Question
Which of the instrument numbers would measure current
Image:
Slide3.JPG (image/JPG)
Answer
  • none of them
  • 1 and 3
  • 2 and 3
  • 1

Question 16

Question
Which of the instrument numbers would measure voltage
Image:
Slide3.JPG (image/JPG)
Answer
  • none of them
  • 3
  • 2
  • 1

Question 17

Question
Meter M1 will measure
Image:
Slide4.JPG (image/JPG)
Answer
  • the supply current
  • the current through R1
  • the volt drop across R1 and R2
  • the volt drop across R1

Question 18

Question
Meter M2 will measure
Image:
Slide4.JPG (image/JPG)
Answer
  • the supply current
  • the current through R1
  • the volt drop across R2 and R3
  • the supply voltage

Question 19

Question
Instrument 4 is measuring
Image:
Instrument_question (image/jpg)
Answer
  • the supply current
  • the current through the resistor
  • the supply voltage
  • the voltage across the resistor

Question 20

Question
Instrument 2 above is measuring
Image:
Instrument_question (image/jpg)
Answer
  • the supply current
  • the current through the resistor
  • the supply voltage
  • the voltage across the resistor

Question 21

Question
Of the following materials which would be the BEST conductor of electricity?
Answer
  • Nichrome
  • Steel
  • Aluminium
  • Copper

Question 22

Question
A poor conductor of electricity is:
Answer
  • Glass
  • Copper
  • Aluminium
  • Silver

Question 23

Question
The resistance of an electrical conductor is:
Answer
  • Affected by the weather
  • Determined by the formula I = P x V
  • Inversely proportional to length and proportional to c.s.a
  • Proportional to the length and inversely proportional to the c.s.a

Question 24

Question
What is the formula for two resistors in parallel?
Answer
  • R1 + R2/R1 - R2
  • R1 - R2/R1 x R2
  • R1 + R2/R1 x R2
  • R1 x R2/R1 + R2

Question 25

Question
When the current through a conductor increases
Answer
  • the voltage decreases
  • the temperature decreases
  • the temperature increases
  • the resistance decreases
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