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Electricity, current, circuit , voltage and resistance practice problems

Quiz by Theuns Swanepoel

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12 questions
Show answers
  • Q1
    What is the unit of electrical resistance?
    Ampere
    Ohm
    Watt
    Volt
    30s
  • Q2
    What is the unit of electric current?
    Ampere
    Watt
    Ohm
    Volt
    30s
  • Q3
    What is the formula for calculating voltage?
    V = I/R
    V = I + R
    V = R/I
    V = IR
    30s
  • Q4
    What is the difference between AC and DC current?
    AC current is only used for small electronics while DC is used for larger power systems
    AC current periodically reverses direction while DC does not
    DC current has a higher voltage than AC current
    AC current flows in one direction while DC periodically reverses direction
    30s
  • Q5
    What is the unit of electric power?
    Volt
    Ohm
    Watt
    Ampere
    30s
  • Q6
    What is Ohm's law?
    The potential difference across a conductor is directly proportional to the current flowing through it
    The resistance in a circuit is directly proportional to the voltage and inversely proportional to the current
    The current in a circuit is directly proportional to the voltage and inversely proportional to the resistance
    The voltage in a circuit is directly proportional to the current and resistance
    30s
  • Q7
    What is the unit of electric resistance?
    Ampere
    Watt
    Ohm
    Volt
    30s
  • Q8
    What is the symbol of electric resistance?
    W
    V
    A
    Ω
    30s
  • Q9
    What is the formula for Ohm's Law?
    V=IP
    V=IR
    P=VI
    I=PR
    30s
  • Q10
    What is the resistance of a 5 ohm resistor in parallel with a 10 ohm resistor?
    15 ohms
    3.33 ohms
    7.5 ohms
    2.5 ohms
    30s
  • Q11
    What is the resistance of a 12 ohm resistor in parallel with a 18 ohm resistor?
    7.2 ohms
    5.4 ohms
    10.8 ohms
    30 ohms
    30s
  • Q12
    What is the voltage across a 10 ohm resistor if a current of 2 amps is flowing through it?
    30V
    5V
    20V
    10V
    30s

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