Resistors and Ohm's Law Video Lessons

Concept

# Problem: A. Consider a circuit containing five identical light bulbs and an ideal battery. Assume that the resistance of each light bulb remains constant. Rank the bulbs (A through E) based on their brightness.Rank from brightest to dimmest. To rank items as equivalent, overlap them.B. The switch shown is initially closed. What happens when it is opened?What happens to bulb C?a) It gets dimmer.b) It gets brighter.c) There is no change.

###### FREE Expert Solution

A.

Bulbs A and B are in Parallel. They are sharing the total current in the circuit equally. The current through each is thus half of the current in the circuit.

Bulb C is in parallel with bulbs D and E. Bulbs D and E combined have twice the resistance of bulb C alone. Thus, Bulb C has two-thirds of the current in the circuit while bulbs D and E have one-third the current in the circuit.

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###### Problem Details

A. Consider a circuit containing five identical light bulbs and an ideal battery. Assume that the resistance of each light bulb remains constant. Rank the bulbs (A through E) based on their brightness.

Rank from brightest to dimmest. To rank items as equivalent, overlap them.

B. The switch shown is initially closed. What happens when it is opened?

What happens to bulb C?

a) It gets dimmer.

b) It gets brighter.

c) There is no change.