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Subelement ZLB
Basic Electrical Theory
Section ZLB05
Ohm's Law
The voltage across a resistor carrying current can be calculated using the formula
  • E = I + R [voltage equals current plus resistance]
  • E = I - R [voltage equals current minus resistance]
  • Correct Answer
    E = I x R [voltage equals current times resistance]
  • E = I / R [voltage equals current divided by resistance]
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A 10 mA current is measured in a 500 ohm resistor. The voltage across the resistor will be
  • Correct Answer
    5 volt
  • 50 volt
  • 500 volt
  • 5000 volt
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The value of a resistor to drop 100 volt with a current of 0.8 milliampere is
  • 125 ohm
  • Correct Answer
    125 kilohm
  • 1250 ohm
  • 1.25 kilohm
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I = E/R is a mathematical equation describing
  • Correct Answer
    Ohm's Law
  • Thevenin's Theorem
  • Kirchoff's First Law
  • Kirchoff's Second Law
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The voltage to cause a current of 4.4 ampere in a 50 ohm resistance is
  • 2220 volt
  • Correct Answer
    220 volt
  • 22.0 volt
  • 0.222 volt
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A current of 2 ampere flows through a 16 ohm resistance. The applied voltage is
  • 8 volt
  • 14 volt
  • 18 volt
  • Correct Answer
    32 volt
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A current of 5 ampere in a 50 ohm resistance produces a potential difference of
  • 20 volt
  • 45 volt
  • 55 volt
  • Correct Answer
    250 volt
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This voltage is needed to cause a current of 200 mA to flow in a lamp of 25 ohm resistance
  • Correct Answer
    5 volt
  • 8 volt
  • 175 volt
  • 225 volt
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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
  • increased to 12 volt
  • Correct Answer
    reduced to 3 volt
  • held constant
  • reduced to zero
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The current flowing through a resistor can be calculated by using the formula
  • I = E x R [current equals voltage times resistance]
  • Correct Answer
    I = E / R [current equals voltage divided by resistance]
  • I = E + R [current equals voltage plus resistance]
  • I = E - R [current equals voltage minus resistance]
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When an 8 ohm resistor is connected across a 12 volt supply the current flow is
  • Correct Answer
    12 / 8 amps
  • 8 / 12 amps
  • 12 - 8 amps
  • 12 + 8 amps
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A circuit has a total resistance of 100 ohm and 50 volt is applied across it. The current flow will be
  • 50 mA
  • Correct Answer
    500 mA
  • 2 ampere
  • 20 ampere
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The following formula gives the resistance of a circuit
  • R = I / E [resistance equals current divided by voltage]
  • R = E x I [resistance equals voltage times current
  • R = E / R [resistance equals voltage divided by resistance]
  • Correct Answer
    R = E / I [resistance equals voltage divided by current]
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A resistor with 10 volt applied across it and passing a current of 1 mA has a value of
  • 10 ohm
  • 100 ohm
  • 1 kilohm
  • Correct Answer
    10 kilohm
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If a 3 volt battery causes 300 mA to flow in a circuit, the circuit resistance is
  • Correct Answer
    10 ohm
  • 9 ohm
  • 5 ohm
  • 3 ohm
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A current of 0.5 ampere flows through a resistor when 12 volt is applied. The value of the resistor is
  • 6 ohms
  • 12.5 ohms
  • 17 ohms
  • Correct Answer
    24 ohms
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The resistor which gives the greatest opposition to current flow is
  • 230 ohm
  • 1.2 kilohm
  • 1600 ohm
  • Correct Answer
    0.5 megohm
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The ohm is the unit of
  • supply voltage
  • electrical pressure
  • current flow
  • Correct Answer
    electrical resistance
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If a 12 volt battery supplies 0.15 ampere to a circuit, the circuit's resistance is
  • 0.15 ohm
  • 1.8 ohm
  • 12 ohm
  • Correct Answer
    80 ohm
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If a 4800 ohm resistor is connected to a 12 volt battery, the current flow is
  • Correct Answer
    2.5 mA
  • 25 mA
  • 40 A
  • 400 A
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