Question
When a bulb is added in parallel to a circuit with a single bulb, does the resistance of the circuit increase, decrease, or remain the same? Does current increase, decrease, or remain the same? Why?
Step 1
The resistance of this circuit is given by the resistance of the bulb, which we denote as $R$. The current in the circuit is given by Ohm's law, $I = \frac{V}{R}$, where $V$ is the voltage of the battery. Show more…
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If a second bulb is added in series to a circuit with a single bulb, does the resistance of the circuit increase, decrease, or remain the same? Does the current through the battery increase, decrease, or remain the same? Why?
If a string of five bulbs in series is added in parallel to a single bulb connected to a battery, you find that the brightness of the original bulb does not change. Has the current through the battery increased, decreased, or stayed the same? Has the resistance of the circuit increased, decreased, or stayed the same? Explain.
How does a parallel circuit change when a branch is added? The total resistance increases, so the current in the circuit decreases. The total resistance decreases, so the current in the circuit increases. The total resistance increases, so bulbs shine at a lower brightness. The total resistance decreases, so bulbs shine at a higher brightness.
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