1. Intermediate Course Technical Revision Karl Davies 1 East Kent Radio Society

2. 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 2

3. 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? 3

4. 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 ? 4

5. 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? 5

6. Energy How Do the following Store/Transfer Energy + - 6

7. R1R1 R2R2 R3R3 Resistors What is the Resistance if R1=100, R2=3.9K, R3=47K ? What is the Resistance if R1, R2 & R3= 150 Ohms ? R 1 R 2 R 3 7

8. Name the Symbols 8