More practice
1. Consider 3 light bulbs, with equal resistance (30 ohms each). They are connected to a 9-V battery.
A. Where will the total resistance of the circuit be greatest - if the bulbs are in series, parallel, or is it the same in both cases?
B. Where will the bulbs "kill" the battery soonest - if the bulbs are in series, parallel, or is it the same in both cases?
C. Full out complete tables for both cases: when the bulbs are in series and when they are in parallel.
2. Repeat 1C above for the case of 2 resistors (30 and 60 ohms) with a 120-V battery. Determine everything we care about for the series and parallel cases.
More practice can be created here:
https://www.explorelearning.com/index.cfm?method=cResource.dspDetail&resourceID=398
Launch the "gizmo" (click on the picture) and build circuits by clicking and dragging components. You can then drag an ammeter onto the wire and it will give you the current. You can also drag a voltmeter to get voltages, but for this you have to drag the + and - to the points "around" the resistor in question. Play with it a little. It works well, once you have the hang of it. You'll only get a few minutes, unless you sign up.
Or if you prefer, here is the original site we used:
https://www.explorelearning.com/index.cfm?method=cResource.dspDetail&resourceID=398
Launch the "gizmo" (click on the picture) and build circuits by clicking and dragging components. You can then drag an ammeter onto the wire and it will give you the current. You can also drag a voltmeter to get voltages, but for this you have to drag the + and - to the points "around" the resistor in question. Play with it a little. It works well, once you have the hang of it. You'll only get a few minutes, unless you sign up.
Or if you prefer, here is the original site we used:
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