Question

1. normally you should only add water to a battery:

a. before charging
b. after charging
c. it doesnt matter when you add water

1. primary voltage configurations in north america are 24, 36 & 48 volts:

true ____ false ____

1. an industrial battery with 18 cells has approximately how many volts?

a. 12
b. 24
c. 36
d. 48

1. you should remove all metallic jewelry before working on batteries because:

a. jewelry is magnetized to the battery
b. if it touches the battery, you could get burned
c. you may lose it

1. after charging a battery, always turn off the charger before disconnecting the battery from the charger.

true ____ false ____

Explanation:

Question 78

Step1: Recall cell voltage

A typical lead - acid battery cell has a voltage of approximately 2 volts.

Step2: Calculate total voltage

If there are 18 cells, the total voltage \(V = 18\times2\) volts.
\(V = 36\) volts.

Metallic jewelry is a conductor. If it touches the battery terminals (which have a potential difference), a large current can flow through the jewelry and your body, causing a burn. Option a is incorrect as jewelry is not magnetized to the battery in a relevant way for this safety concern. Option c is not a safety - related reason for battery work.

When disconnecting a battery from a charger, if the charger is on, there can be a spark due to the inductive nature of the charging circuit. Turning off the charger first reduces the risk of sparks, which can be dangerous (e.g., cause explosions in the presence of battery fumes). So the statement is True.

Answer:

c. 36

Question 79