Transcript Islide14-Revision - Chelmsford Amateur Radio Society

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