Question

Is there a link between a number of bulbs and current drawn from the power pack?

Answer 1

Yup

If current is increased the bulb glows brighter and vic3 versa

Answer 2

Answer:

Actually, we first need to find the resistance of each bulb, then find the equivalent resistance of all the resistors, THEN we find the current flowing through the entire circuit.

Because, sometimes the resistances can be in a parallel resistor setup, and then the current of the circuit will differ from the current of the each resistor.  

Hope this helps. :)

Explanation: