What happens if you connect a car battery the wrong way round?
When the jumper cables were connected backward, this fuse blew. More than one fuses can blow. Once you replace this fuse, start up the car. In most cases, the car should start right up.
What happens if you put jumper cables on in wrong order?
When you reverse the polarity of the jumper cables, you create a drastic increase in the amount of electrical current that runs through them. As a result, the cables may melt or even catch fire.
Why do you connect the positive terminal first?
Connect positive first, negative having less potential won’t arc. The higher the voltage, the greater the chance of arcing and fusion. On a car if negative first and you are touching any metal part of car, when attaching positive there is possibility of arcing through you. Your body becomes part of the circuit.
What happens if you take 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.
What happens when terminals of a battery are connected?
When the two terminals of a battery are connected directly with a wire there will be a low resistance path for the current to flow. The wire will get heated a little bit (depends on the diameter of the wire less the diameter more heat) and the battery will be quickly discharged.
Can both wires be hot?
They are not both hot. One is hot and one is the neutral, but reversing the meter leads won’t tell the difference. There is a potential of 120 V between them, no matter how you measure it.
Why is my common wire hot?
If the neutral is disconnected anywhere between the light bulb and the panel, then the neutral from the light to the point of the break in the neutral will become hot (and the device will be unpowered, because no current will be flowing through it). It might be best to temporarily unscrew any such bulbs.
Why are both black and red wires hot?
The white wire is always neutral, and when the cable has only two conductors, as most 120-volt cables do, the hot wire is black. The red wire is for the light switch. This configuration, sometimes called a half-hot or split-tab outlet, is becoming increasingly popular, so it’s good to know how to wire it.