I agree to a certain extent. A battery voltage changes with its level of charge and also its internal resistance causes a voltage drop as current increases. However as a first approximation consider it a voltage source.
In parallel, currents through the branches add.
In series, current is the same (nowhere to go but down the wire) and voltages add.
In parallel, currents add, like when a river splits and more water flows for the same height drop.
Your lab partner says that a battery provides not a source of constant current, but a source of constant voltage. Do you agree or disagree and why?
Also I am really confused with series and parallel circuits like when voltage, current, and resistance increase and decrease
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so if u add more bulbs to a series they get dimmer, but the voltage increases so how is that possible?
No the voltage across each adds up to the battery voltage.
so the voltage can never really increase more than what the source is?
Exactly, the voltage source provides essentially constant voltage.
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