Electrical Paper Test 2

1. What is the colour of a 10A fuse?  Red.
2. What is the total resistance in the circuit? 12A
3. The fuse is missing from a circuit. How do you measure & workout the correct fuse to replace? Check the fuse box cover. V=IxR  I= V/R. Measure before the fuse box and check with the components Amp rating.
4. What is the total resistance? 7A
5. Customer comes in with the passenger window N/W, What is the correct procedure to take? Measure the voltage at the connection. If good V then put a battery straight to the motor, if it works there must be a bad connection. If no Voltage at the connection, trace back to the switch. If good V at switch check the resistance for voltage drop. 
6. What colour is a 20A fuse? Yellow. 
7. Is the brake light bulb series or parallel? Parallel.
8. How does the central locking work on the front left door? When you lock or unlock the driver door, an electric motor lock or unlocks the passenger door. In the older cars they used vacuum hoses to lock and unlock. When you lock the door the vacuum sucks the lock shut when you unlock the vacuum pushes the lock open.
9.         What does this symbol mean and where would it be found in the car?  Stops the flow of electricity flowing backwards through the circuit and converts AC into DC in the alternator.
10. If a fuse doesnt work, how do you check it out? Get a test light and clip the alligator clip onto an Earth point. Apply power to the fuses, probe the pointy end into the fuses. One side should light up the test light but the other side should remain dead.
11. What is vvvvvvv and where would you find this on a car? Alternator. This is where the rectifier pack converts the AC into DC.
    
12. What Watts is a headlight bulb? This can vary but generally 50W on dip and 70W on high beam.
13. Explain how a relay works including both circuits? A relay is like a switch. When the relay receives low current input it opens or closes a switch which then allows high current to flow through the relay and power up a component. 
14. what is missing? V/   =R    IxR=              V/I=R    IxR=V
15. What is Voltage? Voltage is the strength of electricity flowing through a circuit.
    What is Amps? Amps is the amount of electricity flowing through the circuit.
    What is Resistance? Resistance is the force opposing the flow of electricity.