M3.5

Question 1

What is internal resistance (IR)?

Answer 1

The resistance inside a battery connected to a load

Question 2

What happens to the internal resistance when the battery discharges?

Answer 2

The internal resistance rises

Question 3

At what percentage will a internal resistance battery effect the electrical systems?

Answer 3

At above 75% discharge

Question 4

What happens if the terminals of a battery aren’t clean?

Answer 4

The connection won’t be very goof and it also offers an additional resistance to the current

Question 5

What is the difference between primary and secondary cells (batteries)?

Answer 5

Primary cells cannot be recharged but secondary cells can

Question 6

What types of batteries are used on aircraft?

Answer 6

Lead acid or nickel

Question 7

Lead acid cells have a voltage of 2V when charged so how many volts in the final discharge?

Answer 7

1.83 volts

Question 8

Nickel cadmium cells have a voltage of 1.2v when charged so how many volts in the final discharge?

Answer 8

1 volts

Question 9

When must you refill the electrolyte in a nickel cadmium battery?

Answer 9

When it is fully charged because it will rise whilst charging

Question 10

What are the advantages and disadvantages of a nickel cadmium to lead acid battery?

Answer 10

Advantages:
-better power to weight ratio
-closed circuit voltage remains almost constant throughout discharge 
-larger capacity
Disadvantages:
-more costly
-larger

Question 11

What should you remember when adding multiple batteries into a circuit?

Answer 11

That they’re the same type of battery

Question 12

What the difference between adding batteries in series and in parallel?

Answer 12

When you add them in series you add the voltage together. When adding them in parallel you add the current together.