Help!!!! potential difference?

Question

Please help with my science..........

How does potential difference across the load change as load is increased?

How does potential difference across the battery change as load is increased?

Does the potential difference across the battery change if you turn the circuit off? Why or why not?

Answer 1

-> potential difference across the load will be SLIGHTLY loweredd if the load is increased as more current flow in the circuit and there will be slightly more voltage drop across the battery's internal resistance. Generally internal resistance of the battery is very low and it is series with the battery for calculations.

higher load = lower resistance

potential across the load = Vbatt X Rload / (Rload + Rinternal)

Vbatt  = battery voltage

Rload = Load resistance

Rinternal = Battery interanl resistance

-> Potential difference across the battery will be also slightly lowered

->if the circuit is opened (turn off) there is no current flow in the ckt. There is no voltage drop across the internal resistance. The battery voltage will be slightly highered.

NOTE: the changes does depend on the battery internall resistance and how much current drawing from the load.

Answer 2

1. how do you define increased load? decreased resistance?

Ans: it depends on the circuit. If you just have a battery and a load, and you increase the load, the current increases. The battery voltage, if an ideal battery, will not change.  Real battery, the voltage will go down slightly.

2. Same as no. 1, it is the same voltage.

3. No. because the switch does not turn off the battery, just the connection between the battery and the rest of the circuit. With a real battery, the voltage will go up slightly as the load is removed from the battery.

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