Draw an equivalent circuit and list the sequence of steps to connect jumper cables properly between...

Draw an equivalent circuit and list the sequence of steps to connect jumper cables properly between two car batteries when trying to jump-start a car with a run-down battery. Be sure to label both the positive and negative terminals on each battery and the red and black cables of the jumper. I t is recommended that the last connection you make should be between the black jumper cable and the run-down car; and instead of connecting it to the negative terminal of the battery, you should connect it to the frame of the car at a point away from the battery. What is the rationale for this advice? Does it matter in what order the connections are removed when you have started the car?

Expert Solution

During the jumb - start the positive terminal of the good battry will be connected initially and then the other end of the red jumber wire ( positive jumber wire) will be connected to the positive terminal of the battery directly as shown in the diagram. then after using the black jumber wire the connection is made as shown in the figure good grounding point on both the cars. Then after start the good car and let the engine run for about 15 mins (MAX) then start the dead car.

As shown in the figure technically the chassis ground is directly connected with the negative terminals of the battery

The reason for not directly connecting the black jumber wire with the negative terminal is, usually discharged batteries (Old Batteries) will outgas Hydrogen, and also there is likely to be a arc as sooner the negative circuit is completed, if the arc is near by the battery then the outgas hydrogen will make up fire. So its better to connect the negative terminal away from the battery so mostly can avoid fire or explosion.

After starting the dead car, remove the negative terminal from both the car, do not let the clamps touch each other and then remove the positive terminal from the dead battey's car and then remove the positive wire from the other car.

Removing the positivve terminal from the first car may producce a arc near by the battery, so that may cause fire or explosion.

Manojponduru answered 2 years ago

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