EasyPhysicsHigh School (11–12)High School (9–10)Electricity & Magnetism › Current ElectricityNumerical
A 10.8 V battery is joined across a 4.5 Ω resistor.
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A battery is joined across a resistor. What current flows? What resistor would let only through on the same battery?
Need a reminder? The key ideaShow
Ohm's law: . In series the same current flows and the resistances add; in parallel the same voltage is across every branch and the reciprocals add,
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. The current. .
Step 2. The resistor. .
Answer: , and .
Check. Four times the resistance gives a quarter of the current: .
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