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When two bulbes with 25W and 100W rated at 220V are connected in series with a supply of 440V which will fuse?
Wiki User
∙ 11y ago
The resistance can be derived from:
P = V^2/R
R = V^2/P
For the 100w bulb:
R = 220^2/100 = 484 ohms
For the 25w bulb:
R = 220^2/25 = 1936 ohms
When connected in series, and then connected to 440V, the voltage across the 100w bulb would be:
V = 440*484/(484+1936) = 88V
This is well within spec.
The voltage across the 25w bulb would be:
V = 440*1936/(484+1936) = 352v
This is way over spec, and would cause the bulb to fuse.
Although this answer assumes that a light bulb is a linear resistor, they are not. The resistance of a light bulb changes significantly with voltage and filiament temperature. The 25w light bulb is still the one that fuses, but the non-linearity of the resistance needs to be understood.
Wiki User
∙ 11y ago
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Why do several 40watt and 220volt lamps not light to full brilliance when in series?
To get full brightness, the rated voltage has to be applied across the bulb. When several bulbs are connected in series, the voltage gets devided among these sevral bulbs and correct rated voltage will not be applied acros each bulb, hence the brightness reduces.
Are bulbs brighter in a series or parallel curcuit?
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Is electric cooker connected in series or parallel?
All residential loads are connected in parallel, so that they share the same supply voltage, which is necessary for them to develop their rated power outputs.
Which circuit arrangement will give you brighter bulbs If you have two 5-watt bulbs connected in series and then in parallel?
It depends on the voltage rating of each lamp, and the value of the supply voltage. It's important to understand that a lamp will only operate at its rated power (therefore at its full brightness) when subject to its rated voltage.So, let's assume each lamp is rated at, say, 24 V.If connected in parallel across a 24-V supply, then they will both operate of full brightness.If connected in series across the same 24-V supply, then each lamp will be subject to half its rated voltage, and will be very dim.On the other hand, if connected in series across a 48-V supply, then they will each be subject to 24 V, and will both operate at full brightness.
How is the brightness of the lightness of the lights related to whether you connect the bulbs in series or in parellel?
For a lamp to operate at its rated power, it must be subjected to its rated voltage. Provided this is the case, then it doesn't matter whether lamps are connected in series or in parallel. For example, ten identical lamps, each rated at 12 V, will operate normally if connected in series across a 120-V supply (this is because they will each be subjected to a voltage drop of 12 V). They will also function normally if they are connected in parallel across a 12-V supply.
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Power supply units are rated based on their output and efficiency. When more equipment is connected, a higher output power supply is needed.
Are bulbs in parallel brighter or bulbs in series brighter?
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Are homes connected in series or parellel?
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If you have 2 5-watt bulbs connected in series and then in parallel which circuit arrangement will give you brighter bulbs?
It depends on the voltage rating of each lamp, and the value of the supply voltage. It's important to understand that a lamp will only operate at its rated power (therefore at its full brightness) when subject to its rated voltage.So, let's assume each lamp is rated at, say, 24 V.If connected in parallel across a 24-V supply, then they will both operate of full brightness.If connected in series across the same 24-V supply, then each lamp will be subject to half its rated voltage, and will be very dim.On the other hand, if connected in series across a 48-V supply, then they will each be subject to 24 V, and will both operate at full brightness.
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Why is that when an electric bulb stay just as its bright when connected to a parallel circuit?
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How could you find the purpose of a parallel circuit?
For an electrical load, such as a lamp, heater or motor, to operate at its rated power, it must be subject to its rated voltage which always corresponds to the supply voltage. For this to happen, individual loads must be connected in parallel with the supply and with each other. So all the electrical loads in your home, in your car, etc., are ALL connected in parallel.
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How do you find out total power of two lamps connected in series?
The rated powers, printed on each lamp, will no longer apply. You will need to measure the load current (I) drawn by the two lamps, together with the supply voltage (U), and multiply the two values together: Power = U I
