What is a positive terminal and negative terminal?
Electrical polarity is a term used throughout industries and fields that involve electricity. There are two types of poles: positive (+) and negative (−). This represents the electric potential at the ends of a circuit. A battery has a positive terminal (+ pole) and a negative terminal (− pole).
What is the function of negative terminal?
The negative terminal in a circuit is what provides current. Current is the flow of electrons, and that flow is towards the terminal that is creating the potential for current.
What does a positive terminal do?
Thus the positive terminal is considered to be at “higher” potential energy. This is somewhat analogous to raising a mass in the gravitational field. Work must be done to raise the mass against the force of gravity. The mass gains gravitational potential energy.
What happens if you remove the positive terminal first?
If positive terminal is removed first then chances of a spark are more if this terminal touches the body through the metal spanner or wrench you are opening with is grounded accidentally and may end in flames because lot of combustible material is around. And chances of this accidental touch are very high.
Do you need to disconnect both battery terminals?
The grounded terminal should be disconnected first to ensure that a battery dead-short does not occur, should the spanner disconnecting the other one contact a nearby grounded metal part. A battery dead-short will result in short circuit currents of the order of hundreds of amperes and heavy sparks.
Why is it necessary to remove the battery negative cable first before removing the positive cable?
By removing the negative battery cable you are disconnecting the battery from the chassis of your vehicle. If you begin to remove the positive side before the negative and your wrench would make contact with any part of the vehicle, then you could cause a short in the system.
What will happen if the positive and negative cables touch each other?
Current flow from positive to negative no matter whatever load you put there will be flow of current. In this case the wire acts as load, as no work or charge is required for the wire heavy current flows. If you hold both wire together firmly then you can notice the wire and battery will heat up.
Why do you remove negative terminal first?
It’s important to disconnect the negative side of the battery first, otherwise you can cause an electrical short if the positive is removed first.