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Why does the resistance in a series circuit which includes a light bulb increase when the bulb lights up?
Wiki User
∙ 14y ago
When the current increases as a voltage is applied to the bulb it causes the bulb's special wire filament to get so hot that it glows very brightly. The heating causes changes in the normal electron lattice of the filament, creating more barriers to the flow of the electrons and therefore the resistance of the wire increases as it gets hotter.
Wiki User
∙ 14y ago
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What is the use of photoresistors?
Photoresistors also known as light dependent resistor (LDR) are used to increase light intensity by decreasing resistance. This is applied to camera lights, street lights, solar street lamps.
Are street lights on a series circuit or a parallel circuit?
Parallel. One light burning out does not stop all current flow to the other lights.
If the lights in a room are off the circuit is?
Open.
What happens to the brightness of the lights when you decrease the number of light bulbs in a circuit?
The brightness of the lights may or may not change depending on the circuit in which they are wired. In a series circuit, all the bulbs (called lamps) will experience the same current flow. The same amount of current will be flowing through each one, and each one will be dropping some amount of voltage. If we remove some of the lamps and reconnect the circuit, the lamps will glow brighter because there is less total resistance in the circuit. The remaining lamps will end up dropping more voltage, and will glow brighter. In a parallel circuit, removing bulbs (or adding them) will not affect the operation of the other lamps in the circuit (providing the voltage source is adequate). We know that each of the lights in a household circuit is wired in parallel, and turning one or more on or off won't affect the operation (the brightness) of any other light that is on.
How are parallel circuit lights better than series circuit lights using science facts?
In a parallel circuit, there are multiple paths for electricity to flow. So, if one switch is turned off there is still other paths for electricity to flow so the other lights can remain on. However, in a series circuit there is only one path for the electricity to travel. So, if the switch in a series circuit was turned off the electricity would stop flowing causing all the lights to go out.
What happens to the current in the other lights if one light burns out in a series circuit?
It depends what is the outcome of burning. If that light has created open circuit, circuit will break and there will not be any current. But if there is short circuit means overall resistance is decreased. Thus current will increase. Besides overall brightness will also increase. Thus, if in a series lesser the number of bulbs more will be brightness.
Compare and contrast series and parallel circuits?
In a series circuit, there is only one path for the current to flow through. In a parallel circuit, there are multiple paths for the current to flow through. For example, most old Christmas lights are series circuits. If one light in the whole strand of lights went out, then all the lights would go out. This is because once one resistance is out, the circuit is no longer complete, so the current can not flow. An example of a parallel circuit could be your household lighting. When you turn on your kitchen lights, your bathroom lights don't turn on with it, do they? That is because it is a parallel circuit. In a parallel circuit, there are multiple paths for the current. It doesn't matter if one light is on and another is off because the current can go through another way. In a series circuit as you increase resistance, the voltage and current decrease. In a parallel circuit, as you increase resistance, the voltage and current increase. Think of a series circuit as a one-lane road. The car would be the current, the gas in the car would the voltage, and the traffic lights would be the resistance. Since you are on a one-lane road, as you keep stopping at traffic lights, you aren't going very fast or far. Now, think of parallel circuits as a multi-lane road (or highway). The car is the current, the gas in the car is the voltage, and the traffic lights (or closed roads, or accidents, anything that would slow you down on the road) are the resistance. When you are driving and one road is closed, you don't have to stop because you can continue driving and go on a different road to reach your destination.
Are lights onor off in an open circuit?
If the lights are the load of the circuit, then the lights will be off if the circuit is open.
In an closed circuit will the lights be on or off?
Lights are on in closed circuit. It means that is a current flowing when circuit is being closed.
When a home circuit breaker opens the lights in some rooms go off but the lights in some rooms stay on. Explain why.?
The circuit breakers in a panelboard feed separate circuits. The lights that stay on are on a different circuit than the ones that go off. To fine the circuit that feeds the lights that stay on, go to the panelboard and turn off the breakers one by one until the lights go out. This is the circuit that feeds that circuit of lights. Remember that lights and receptacles can be on the same circuit together.
Are fluorescent lights on a parallel circuit or a series circuit?
series circuit
What is the use of photoresistors?
Photoresistors also known as light dependent resistor (LDR) are used to increase light intensity by decreasing resistance. This is applied to camera lights, street lights, solar street lamps.
How do you make a circuit so the lights can be turned on and off separatley?
To design a circuit so that lights can be turned on and off separately, we connect the circuit in parallel.
What is a circuit that lights up even if one bulb is out?
A parallel circuit lights up even when one bulb is out.
What type of circuit off all lights when you take on bulb out?
If you remove one light from a chain of lights, and the other lights turn off, then it is a 'series' circuit.
Would you use Series or parallel circuit for Christmas lights?
Yes you would use a serial circuit You would use parallel circuit lights for a Christmas tree because if you used series circuit lights, and one of the bulb blows, the rest of the bulbs will go out. But with parallel circuit lights, if one bulb blows the rest of the bulbs will remain their brightness.
Electric lights will not come on unless their electrical circuit is a parallel circuit?
No, electric lights come in both parallel and series circuit.
