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FAQ

Hey, just a bit of physics revision and I was wondering if anyone knew the function of these circuit components, what they do in the circuit, what they measure, why it's needed, etc. Here are the components in a circuit I need to know about:SwitchCellBatteryDiodeResistorVariable resistor LampFuseVoltmeterAmmeterThermistorI.D.R (What does that stand for?!)It would be great to go into detail of what they really do, although some may seem quite straight forward, and just common sense! Even if you don't know them all, or you just know a few, the explanations still help :) Thanks!

Switch- Turns the circuit on. Cell- Basically, a single battery Battery- A pair of cells. Diode- A semiconductor device with two terminals, typically allowing the flow of current in one direction only. Resistor-A resistor is an electrical component that limits or regulates the flow of electrical current in an electronic circuit. Variable Resistor- A variable resistor is a potentiometer with only two connecting wires instead of three. Lamp- A device for giving light, either one consisting of an electric bulb, together with its holder and shade or cover, or one burning gas or a liquid fuel. Fuse-an electrical device that can interrupt the flow of electrical current when it is overloaded. Voltmeter- A device that measures Volts. Ammeter- A device that measures Amps. Thermistor-A resistor whose resistance varies as a function of temperature. Thermistors are used in electrical devices such as thermometers and thermostats that measure, monitor, or regulate temperature. I.D.R- Interval data recorder.

i am having a hard time trying to figure out how power is distributed from the battery to the fuse box and then to the components. i know some things like the starter dont go to the fuse box. but how is power given to the fuse box? is there a wire or something that gives power to the fuse box from the battery because when i look at a fuse box it dosent have a positive and negative wire for every fuse, so does the fuse box have like a positive and negative plate of some sort. i guess what im basically asking is how a fuse box is made. thanks.

Gandalf waves his wand and magic happens? Of COURSE there's a wire, you NOOB! If you want a diagram of the electrical system in your car then go buy a service/repair manual for your car. They have wiring diagrams in them.

If I drive my car at like 8pm my battery will be fine the next day. But if I don't drive after I get off work at 4 then the next day it won't start.I will have some power like the light under the hood. It always starts when I jump it.I had my alternator tested and it's fine. The same goes for my battery.Any ideas?

There is a short. You need a voltmeter with an amp setting. Disconnect the negative battery cable. Put one voltmeter lead onto the negative battery post and another onto the negative battery cable. If you read more than 50 mA it is being drained through a short. 0-10 mA is more typical. Find the fuse box inside the car, often near the brake pedal, and start pulling fuses one by one until the short disappears. Find the name of the fuse connected to the short and that's where your problem is. Next remove/replace/fix that component. As a temporary solution you may leave that fuse out if the component is not essential. If you don't understand the name of the fuse then try google. If you don't want to get a voltmeter then disconnect the negative battery terminal when you aren't driving the car, then reconnect when you need it. This will prevent any power drain. Take it to a mechanic and he'll know how to do the above quickly and easily.

Contrast how a fuse and a circuit breaker work to prevent overloading in circuits.

A fuse is a one time use component, it self destructs in order to open the circuit. A circuit breaker is a reusable/resettable protection device. Once tripped and the circuit fault repaired a circuit breaker may be reset

I have a 240 watt car amp and every time i put my ground wire in the fuse blows and the only other thing i have hooked up is my power no speakers or remote just the ground and power can someone please help me?

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I bought a bargain DAB radio, when I got it home it ran fine, then seemed to keep cutting out, would run finerepeat.Something suggested the power might be to blame, looked at the fuse, the plug is labelled 3amp, but someone had put in a 13 amp fuse. Will the radio be damaged through running with the wrong fuse?As I say, I paid a very bargain price for this, so if I'm gonna get a year or so's use, I'm happy enough. Not expecting too much anyway, and quite lazy about taking it back. But if it's going to be a useless lump by this time tomorrowCheers for any advice

it depends whether or not the radio received more 3 amps. if it did it is most likely ruined as normally the fuse will have stopped this happening. my only advice is to put the correct fuse in the radio and try it then if it still does not work it was ruined.

have replaced alternator, speed control censer, electric fuel pump. When fuses are replaced car starts , but dies when put in reverse. and blows another relay fuse.

You have a short somewhere either in your starter or that speed sensor you replaced. I would check all wiring if no short i would be looking at the ECU.

Even when my A/C is completely turned off in the car, the A/C compressor continues to run. It freezes my evaporator coil to where air will not even blow through my vents. Even the techs at the Mitsubishi dealership are scratching their heads. The only way I can shut it down is to pull the 10 amp fuse under the hood, that is for the A/C. Someone please help me!

did they replace the relay? if not you might want to think about replacing the compressor.