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Principles of basic electrical circuits

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Quiz on Principles of basic electrical circuits, created by r.t.mathews on 24/11/2015.
r.t.mathews
Quiz by r.t.mathews, updated more than 1 year ago More Less
Vito Martino
Created by Vito Martino over 8 years ago
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Copied by r.t.mathews over 8 years ago
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Resource summary

Question 1

Question
Look at the following question
Image:
Resistivity_Q1 (image/jpg)
Answer
  • 0.356 Ω
  • 0.536 Ω
  • 0.178 Ω
  • 0.235 Ω

Question 2

Question
Answer the following question
Image:
Slide1.JPG (image/JPG)
Answer
  • 50 m
  • 25 m
  • 30 m
  • 40 m

Question 3

Question
Answer the following questions
Image:
Slide2.JPG (image/JPG)
Answer
  • 0.065 Ω
  • 0.552 Ω
  • 0.045 Ω
  • 0.055 Ω

Question 4

Question
Which of the following formulas can calculate power in a resistive circuit
Answer

Question 5

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 6

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 7

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 8

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 9

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 10

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 11

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 12

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 13

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 14

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 15

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

Question 16

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

Question 17

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

Question 18

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 19

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 20

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

Question 21

Question
When current flows in a conductor, a magnetic field is created around the conductor
Answer
  • when the voltage is high enough
  • only if it is a coil
  • as long as the current flows
  • only when d.c is applied

Question 22

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 23

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 24

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 25

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 26

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

Question 27

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

Question 28

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 29

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 30

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

Question 31

Question
The current in a circuit is 100A and the resistance is 0.1 Ohm. The supply voltage is
Answer
  • 14V
  • 20V
  • 12V
  • 10V

Question 32

Question
The equation for current flowing in a resistive circuit is
Answer
  • I = R/P
  • I = R/V
  • I = P/R
  • I = V/R

Question 33

Question
The total resistance of two resistors of 20 Ohms and 35 Ohms connected in series is
Answer
  • 50 Ohms
  • 45 Ohms
  • 15 Ohms
  • 55 Ohms

Question 34

Question
When an electric current flows through a conductor it
Answer
  • Cools down and expands
  • Cools down and contracts
  • Heats up and contracts
  • Heats up and expands
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