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Chelmsford Amateur Radio Society Intermediate Course Technical Revision Chelmsford Amateur Radio Society Intermediate Licence Course Murray Niman G6JYB Slide Set 14 Technical Revision 1 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 Chelmsford Amateur Radio Society Intermediate Licence Course Murray Niman G6JYB Slide Set 14 Technical Revision 2 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? Chelmsford Amateur Radio Society Intermediate Licence Course Murray Niman G6JYB Slide Set 14 Technical Revision 3 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 ? Chelmsford Amateur Radio Society Intermediate Licence Course Murray Niman G6JYB Slide Set 14 Technical Revision 4 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? Chelmsford Amateur Radio Society Intermediate Licence Course Murray Niman G6JYB Slide Set 14 Technical Revision 5 Energy • How Do the following Store/Transfer Energy + - Chelmsford Amateur Radio Society Intermediate Licence Course Murray Niman G6JYB Slide Set 14 Technical Revision 6 Resistors • What is the Resistance if R1=100, R2=3.9K, R3=47K ? R1 • What is the Resistance if R1, R2 & R3= 150 Ohms R2 R3 R1 R2 R3 Chelmsford Amateur Radio Society Intermediate Licence Course Murray Niman G6JYB Slide Set 14 Technical Revision 7 Name the Symbols Chelmsford Amateur Radio Society Intermediate Licence Course Murray Niman G6JYB Slide Set 14 Technical Revision 8