A student wants the resistance of a bulb…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A student wants the resistance of a bulb. Which meters does she use, and how are they joined? Her readings are and . What is the resistance?
Need a reminder? The key ideaShow
The potential difference is the work done per coulomb: , in volts (). So . An ammeter goes in series; a voltmeter goes in parallel.
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 meters. An ammeter in series with the bulb, for the current. A voltmeter in parallel across it, for the potential difference.
Step 2. The resistance. .
Answer: ammeter in series, voltmeter in parallel; .
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