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Why powerful lamps have lower resistance than less powerful lamps?
Lekhrajmeena
Power is voltage squared, divided by resistance (P = V2/R) so, for a given voltage, the lower the resistance, the greater the power!
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∙ 11y ago
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How does resisitance affect currents?
The higher the resistance the less current can pass through therefore the current will be lower.
What will happen in a series circuit if one bulb is added?
If one more light bulb is added to a series string of light bulbs while the voltage supplied across theends of the string remains constant, then the total resistance of the string increases, causing thecurrent in the string to decrease, and every bulb glows less brightly than it did before the new onewas added.
Why does resistance increase in thinner wires?
A thick wire has its cross section area more than that of the thin one .Since the resistance of a material is inversely proportional to its resistance, resistance of thick wire is less compared to.[as cross section area increases the no electrons drifted increases].this applies only to OHMICdevices.
Why is resistance less when resistors are join in parallel?
What do you mean? In a parallel circuit, the combined (or effective) resistance is less than any individual resistance.
What happens to the brightness of the bulbs in a parallel circuit?
A lamp's rated power only applies when the lamp is supplied with its rated voltage. If you connect the lamps in series, with the same supply voltage, then the lamps are no longer subjected to their rated voltage and, so, will not operate at their rated power.
Why do bulbs get dimmer in series circuits?
When light bulbs are connected in series circuits, they will get dimmer whenever a bulb is added. This is because the current is shared between all of the bulbs equally.AnswerLamps only operate at their rated power when subjected to their rated voltage. If you connect lamps in series, each lamp will be subject to a lower voltage, so they will not operate at their rated power and, so, will be dimmer. The more powerful lamps will actually glow less than the less-powerful lamps because their resistance is lower and the voltage drop across them will also be lower than the voltage drop across the less powerful lamps.
Do two light bulbs in a series circuit have the same brightness?
yes but they will each be less bright then if there was only one light bulb in the circuitAnswerIt depends on their power ratings. If they are different, then the lamp with the lower power rating will be the brighter. The reason for this is that lower power lamps have a greater resistance than higher power lamps and, so, a greater voltage drop appears across the lower power lamp, making them brighter.
Two light bulbs are in series how much power is dissipated by each bulb?
this is not an easy question. Assuming these are incandescent lamps with tungsten filaments, we need to know the type and rating of the lamps (bulbs) and the voltage. Incandescent lamps are highly non-linear and vary greatly in resistance depending on temperature--at lower voltage, the temperature is lower and the resistance is less. The problem is finding the stable operating point at the lower voltage. Probably the easiest way to answer this is build the circuit and measure. As a general rule, if the two in series bulbs are equal wattage, each one will dissipate 1/3 of its rated wattage (at half voltage). So two 25W bulbs in series will each dissipate about 8W, or 16W total.
Which bulb will glow brighter two bulbs of rating 100w-220vand200w-220v are connected in a series to a supply of 22ov?
For a lamp to operate at its rated power, it must be subject to its rated voltage. The lower the voltage, the lower the resulting power. In fact, a small drop in voltage will cause substantial drop in power. Higher 'wattage' lamps have lower resistance values than lower 'wattage' lamps.So, if you put two lamps in series, the greater voltage drop will appear across the lamp with the greater resistance. In your example, that means the 100-W lamp will be subject to the greater voltage drop, and its loss of power will be less than that of the 200-W lamp. So the lower power lamp will be the brighter of the two.
Why would a cell connected to two bulbs that are connected in series last longer than if the same two bulbs are connected in parallel?
This question looks like one that has been asked by a high-school teacher with very little knowledge of electrical science, and who doesn't realise that the resistance of a lamp changes appreciable between when it is cold and when it is hot! (Either that, or he is being devious!)So, as stated, this question is not straightforward, because incandescent lamps that operate at their rated voltage and power have a 'hot' resistance that is around 15 - 20 times their resistance when cold. Lamps in series are not subject to their rated voltage and, so, their resistance will be relatively low in comparison. So, what the question comes down to is whether the combined (high) resistance of lamps in parallel (i.e. half the resistance of one of the lamps) higher or lower than the combined resistance (low) of the same lamps connected in series (twice that of one of the lamps)? You could find this out experimentally, but I'd be inclined to believe that the two lamps connected in parallel are more likely to have the higher resistance and, therefore, the cell supplying them would last longer -in other words, opposite to that in your question!Now, if you simply used two resistors (whose resistance doesn't change appreciably with temperature) then the two connected in series would definitely have a higher resistance (twice) than if they were connected in parallel (half), and they would draw less current and the cell would last longer.
How does resisitance affect currents?
The higher the resistance the less current can pass through therefore the current will be lower.
What will happen in a series circuit if one bulb is added?
If one more light bulb is added to a series string of light bulbs while the voltage supplied across theends of the string remains constant, then the total resistance of the string increases, causing thecurrent in the string to decrease, and every bulb glows less brightly than it did before the new onewas added.
If two different wattage lamp connected in series which lamp will glow brighter and why?
I was also searching for the same but according to me the lamps with higher wattage should glow brighter. We know that, P=VI In series connection current is same through all the lamps but voltage across each lamp depends on the wattage of the bulb. So the bulb with higher wattage will draw more voltage and glow brighter.AnswerUnfortunately, the previous answer is incorrect, although it seems* to be the logical answer! The higher-wattage lamp has a lower resistance than the lower-wattage lamp. So, when they are connected in series, the larger voltage drop (IR)will appear across the lower-wattage lamp. As power is proportional to the square of the voltage, it is the lower-wattage lamp that will be the brighter.[*Many people have the mistaken belief that a higher-wattage lamp has a higher resistance than a lower-wattage lamp. That's the wrong way around!]
Why do aeroplanes have pointed front ends?
It is for aerodynamics. It reduces wind resistance, allowing the plane to fly faster and/or use less fuel, or to use a less powerful engine to fly just as fast.
Why does resistance increase in thinner wires?
A thick wire has its cross section area more than that of the thin one .Since the resistance of a material is inversely proportional to its resistance, resistance of thick wire is less compared to.[as cross section area increases the no electrons drifted increases].this applies only to OHMICdevices.
Why is air resistance bad?
Air resistance is neither good nor bad, it is simply a factor. Air resistance costs us in terms of performance, a car with high wind resistance gets lower mileage than one with less; but without air resistance planes would not fly at all.
Is air resistance bad?
Air resistance is neither good nor bad, it is simply a factor. Air resistance costs us in terms of performance, a car with high wind resistance gets lower mileage than one with less; but without air resistance planes would not fly at all.
