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Why does it take more amperage to start a car than it does to run a car?
Wiki User
∙ 16y ago
An engine is typically started by operating an electric motor (the starter,) which spins to crank over the gas engine. Because of the amount of compression in the cylinders, it takes a large amount of torque to get the engine cranking. In order to crank the engine fast enough to start, the starter needs a lot of amperage (or current) to apply the amount of torque required.
Generally speaking, a starter can draw 250 amps or more to start the engine.
Once the engine is running, a generator or alternator takes over and recharges the battery as well as powers all of the necessary electrical circuits in the car. To keep the engine running, the alternator must provide power to what is known as a coil. The coil takes 12v from the power source and converts it to as much as 12,000 volts through a phenomenon called "induction", which fires the spark plugs.
So whether a car is starting or running, there is dangerously high amperage running through the car at all times.
Wiki User
∙ 16y ago
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What is crank amperage?
Amperage (energy) required to make starter turn fast enough to start vehicle usually not more than 250 amps
To increase amperage output using more than one batteries connect the batteries?
Parallel
Why 2 batteries in diesel?
Higher cranking amperage... diesels can take a bit more effort to start, especially in cold weather. Two is common for light duty vehicles.. medium- and heavy duty trucks often use four.
Horn fuse 1986 k-car?
The fuse in a circuit is designed to protect the wiring first and foremost. If there is a fault in the horn or other parts of the circuit, that causes a short circuit, then it could melt the wire and cause damage to other components or even a fire. The idea would be that the fuse would blow instead. If you take a look at the size of the wiring you will find several websites that will tell you the maximum amperage the wire can take. The actual amperage required to run a diaphragm horn is quite low, less than 5 amps at 12V. If you have air horns the start up amperage of the compressor can be much higher. You might find that there are other ancilleries running off the same supply though, so the fuse amperage needs to be less than the cable can take but high enough for the sum amperage of the ancilleries on the circuit.
Why is 240 volt electricity more dangerous than 12 volt electricity?
It is neither more or less dangerous . The determining danger factor is amperage.
Why my 14.4 volts car battery can't start my pick up truck?
14.4 volts? My car battery is nominally 12 volts. That aside... Voltage is only part of the equation. Amperage is also important. A truck probably has a larger engine which requires more power to start than a small car engine does. One way to think about this is that if you connect a 1/2 inch pipe and a 4 inch pipe to a water tower, both of them will have the same pressure (voltage) but the 4 inch pipe will fill a swimming pool a lot faster (more amperage). You can usually jump start a pickup from a (running) car, because at that point you're drawing on the amperage provided by the alternator rather than the "cold cranking amps" of the battery itself.
How do you stop a car battery from dying in the winter?
In the winter, your car's oil starts to congeal making the car harder to start. It takes more amperage than in summer to run the starter. Three things could be happening. First: you could be using an inadequate battery. You could be using a battery at the low end of the amperage range that will start your car. You need to get a more powerful battery with greater amperage. Second: batteries slowly wear out. As pieces of the electrodes wear out and fall to the bottom of the battery, the battery looses amperage and must be replaced with one of adequate size. Third: you could have a wire with some insulation worn. Electricity from the battery can slowly leak out of your battery. Enough can remain to start your car in summer but not in winter. You can check your wires for worn insulation.
How long does it take to make a thin medium pizza?
if you start fro nothing, more than 40 mins.
What to do if used car won't start?
Find somebody who knows more than you about cars and ask them to take a look at it.
Why do we use thicker wires for heaters than for lamps?
Heaters draw a lot more amperage. As your amperage increases, so does resistance to the flow of the current. Too much resistance, and your wire overheats, melts the casing, and can potentially catch fire.
Your car shuts off after you jump start the car and take off the cables?
More than likely a bad alternator.
Can you run a motor of greater amperage draw with a motor of less amperage draw?
It looks like you are asking if a higher amperage motor can replace a lower amperage motor. It depends on what the amperage difference is. If the amperage is high enough to move the capacity of the wire out of its rated value then it should not be done.Remember motor conductors have to be rated at 125% of the motors nameplate amperage. As the amperage increases so does the HP and the motor's protection will also have to be increased or the motor will trip the lower overload protection settings.Also keep in mind that if the motor is three phase, running a motor with higher HP on a load that does not need the extra HP, it will lower the power factor of the supply distribution.
