Cells connected in Series?

Question

I have a lab to right and the purpose is:

As more cells are added in series what is the effect on...

-bulb brightness

-voltage supply

-voltage drop

-current

I tried the lab but the equipment sucks so my results are really inconsistent. Please help!

thanks!

Answer 1

Adding cells in series contributes to the Voltage source potential. i.e. 3 x 1.5V cells = 4.5V adding a fourth 1.5V cell you now have 6.0V.

The Bulb gets brighter since Watt = V^2 / R (voltage squared divided by Resistance of bulb).

The Voltage drop across the bulb = Voltage source

The current increases: I = W / V = (V^2 / R ) / V = V / R

ex: for a 10watt bulb the I = 10w / 6.0V = 1.67amps

Answer 2

-bulb brightness:  The bulb gets brighter (until it gets too bright and burns out if you add too many cells in series).

-voltage supply: The voltage of each cell adds up in series so, the voltage gets larger

-voltage drop:  ??? I need more information as to where you are measuring the voltage drop.

-current:  the current remains the same for a single cell, when cells are added in series (so long as each cell is identical).

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