Chelmsford Amateur Radio Society Intermediate Course Technical Revision

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Chelmsford Amateur Radio Society Intermediate
CourseTechnical Revision
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Resistors Power

• From the three band colour code what is the value
  of a resistor with the bands Red Green Brown and
  tolerance of gold ?
• What is the colour code for 3.9 Ohms 10
• On a Car (assume 12V Battery), what current flows
  in a 60 Watt headlamp bulb
• If an LED needs 10mA to light , what resistor is
  needed for a 5.1v Supply, and what is its colour
  code

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Circuits

• The diagram represents what part of a circuit ?
• a) A capacitor and inductor in parallel.
• b) A capacitor and resistor in parallel.
• c) A series tuned circuit
• d) A parallel tuned circuit

• Will the lamp light?

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Safety

• Assuming that you are operating on a mains supply
  of 230v, with an appliance having a power
  consumption of 460 watts, what is current rating
  of the fuse that should to be used for safety?
• a) 1 amp
• b) 3 amp
• c) 5 amp
• d) 13 amp
• What is the correct angle to try and ensure the
  safe use of a ladder ?

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Volts Current

• What is the unit and abbreviation for Potential
  Difference ?
• a) V Volts
• b) v volts
• c) I Amps
• d) i amps

• In the circuit diagram which is the correct place
  to put an ammeter to measure the circuit's
  current?

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Energy

• How Do the following Store/Transfer Energy

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Resistors

• What is the Resistance if R1100, R23.9K,
  R347K ?

• What is the Resistance if R1, R2 R3 150 Ohms

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Name the Symbols