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Rene
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RafaA bulb with higher resistance will make the bulb be dimmer. The light output of a bulb is related to the power rating of that bulb. P=(I^2)xR. Power is equal to the current squares times the resistance. By increasing the resistance with a constant voltage source will reduce the current. By using that equation you can see that even though your resistance is increased your current is reduced exponentially.
R=10 ohms
Ex.
V=120v
R=10 ohm
I=V/R
120/10 = 12 amps
P=(12^2)x10
=1440 watts
R=20 ohms
I=120/20
=6 amps
P=(6^2)x20
=720 watts
You can see that increasing your resistance will reduce your power output which will reduce the brightness of you bulb.
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What happens to the current flowing in the ring main as more bulbs are turned on at night?
As more light bulbs are added in a series circuit, the effective resistance of the circuit increases. That causes the current leaving the source to decrease.
In a parallel circuit adding more bulbs will increase?
It will decrease the effective load resistance across the power supply terminals, increase the total current through the load, and increase the total power required to be supplied by the power supply.
What happens when you add a resistor to a series circuit with a light bulb?
As you add more bulbs to a series circuit that means that the bulbs are in series to one another, therefore the total resistance is the sum of the individual resistance of the bulbs. If you add bulbs of the same resistance,then the rate at which the resistance changes will increase in a constant manner provided the current source is not altered. For instance if the bulb you are using is rated 20v,60w, then the current passing via the bulbs in series is the square of the voltage divided by the power in this case the current is approximately 7amperes.
Will each of two bulbs connected in parallel be as bright as a single bulb connected to a cell?
The brightness of an incandescent light bulb depends on the voltage applied across its terminals. Connecting one, two, or five light bulbs of the same rating to a battery in parallel will provide the same brightness from each bulb.
What will happen if more bulbs are added to a circuit with one cell?
YESAnswerNot necessarily. The current depends on the potential difference and the load resistance. If you connect cells in parallel, you do not effect its voltage or the load, so the current is unaffected (although the battery's current 'capacity' will increase). If you connect the cells in series, then you will increase the voltage and the current will increase.
