Questions - Ohm's law

Question file 5

  STUDY NOTES        QUESTIONS WITH ANSWERS 

     
  1. The voltage across a resistor carrying current can be calculated using the formula:
    1. E = I + R [voltage equals current plus resistance]
    2. E = I - R [voltage equals current minus resistance]
    3. E = I x R [voltage equals current times resistance]
    4. E = I / R [voltage equals current divided by resistance]
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  2. A 10 mA current is measured in a 500 ohm resistor. The voltage across the resistor will be:
    1. 5 volt
    2. 50 volt
    3. 500 volt
    4. 5000 volt
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  3. The value of a resistor to drop 100 volt with a current of 0.8 milliampere is:
    1. 125 ohm
    2. 125 kilohm
    3. 1250 ohm
    4. 1.25 kilohm
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  4. I = E/R is a mathematical equation describing:
    1. Ohm's Law
    2. Thevenin's Theorem
    3. Kirchoff's First Law
    4. Kirchoff's Second Law
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  5. The voltage to cause a current of 4.4 ampere in a 50 ohm resistance is:
    1. 2220 volt
    2. 220 volt
    3. 22.0 volt
    4. 0.222 volt
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  6. A current of 2 ampere flows through a 16 ohm resistance. The applied voltage is:
    1. 8 volt
    2. 14 volt
    3. 18 volt
    4. 32 volt
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  7. A current of 5 ampere in a 50 ohm resistance produces a potential difference of:
    1. 20 volt
    2. 45 volt
    3. 55 volt
    4. 250 volt
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  8. This voltage is needed to cause a current of 200 mA to flow in a lamp of 25 ohm resistance:
    1. 5 volt
    2. 8 volt
    3. 175 volt
    4. 225 volt
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  9. A current of 0.5 ampere flows through a resistance when 6 volt is applied. To change the current to 0.25 ampere the voltage must be:
    1. increased to 12 volt
    2. reduced to 3 volt
    3. held constant
    4. reduced to zero
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  10. The current flowing through a resistor can be calculated by using the formula:
    1. I = E x R [current equals voltage times resistance]
    2. I = E / R [current equals voltage divided by resistance]
    3. I = E + R [current equals voltage plus resistance]
    4. I = E - R [current equals voltage minus resistance]
    ==================
  11. When an 8 ohm resistor is connected across a 12 volt supply the current flow is:
    1. 12 / 8 amps
    2. 8 / 12 amps
    3. 12 - 8 amps
    4. 12 + 8 amps
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  12. A circuit has a total resistance of 100 ohm and 50 volt is applied across it. The current flow will be:
    1. 50 mA
    2. 500 mA
    3. 2 ampere
    4. 20 ampere
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  13. The following formula gives the resistance of a circuit:
    1. R = I / E [resistance equals current divided by voltage]
    2. R = E x I [resistance equals voltage times current
    3. R = E / R [resistance equals voltage divided by resistance]
    4. R = E / I [resistance equals voltage divided by current]
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  14. A resistor with 10 volt applied across it and passing a current of 1 mA has a value of:
    1. 10 ohm
    2. 100 ohm
    3. 1 kilohm
    4. 10 kilohm
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  15. If a 3 volt battery causes 300 mA to flow in a circuit, the circuit resistance is:
    1. 10 ohm
    2. 9 ohm
    3. 5 ohm
    4. 3 ohm
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  16. A current of 0.5 ampere flows through a resistor when 12 volt is applied. The value of the resistor is:
    1. 6 ohms
    2. 12.5 ohms
    3. 17 ohms
    4. 24 ohms
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  17. The resistor which gives the greatest opposition to current flow is:
    1. 230 ohm
    2. 1.2 kilohm
    3. 1600 ohm
    4. 0.5 megohm
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  18. The ohm is the unit of:
    1. supply voltage
    2. electrical pressure
    3. current flow
    4. electrical resistance
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  19. If a 12 volt battery supplies 0.15 ampere to a circuit, the circuit's resistance is:
    1. 0.15 ohm
    2. 1.8 ohm
    3. 12 ohm
    4. 80 ohm
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  20. If a 4800 ohm resistor is connected to a 12 volt battery, the current flow is:
    1. 2.5 mA
    2. 25 mA
    3. 40 A
    4. 400 A
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