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Q: What happens to the brightness of light bulbs when more batteries are added Why?
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Would the brightness of a parallel circuit of 3 globes increase or decrease when a fourth is added?

The brightness would remain constant but the power draw will increase. If the circuit was series wired, the brightness would go down as you added bulbs.


How would you compare the brightness of the bulbs as you increase the number of bulbs?

-- If the bulbs are in parallel, then the addition of a bulb has no effect on the brightness of those that were there before. -- If the bulbs are in series, then the addition of a bulb causes the brightness of those that were there before to decrease. (And I wasn't even there when you did the experiment !)


What happens to the brightness of the other two when one of the bulbs burn out three identical bulbs are wired in series?

As a series circuit, as asked, all bulbs will go off because of that just one bulb.


What do you notice about the brightness of the bulbs in the parallel curcuits as you add more bulbs to it?

Nothing if the current capacity of the circuit is not exceeded. The extra bulb will draw more current and if the limit is not reached all bulbs will continue at their rated brightness. If the current capacity is overrdrawn either the circuit breakeer will break and stop all lights or if the capacity is not fused all lights will dim.


You are building a string of lights using several bulbs how is the brightness of the lights related to whether you connect the bulbs in series or in parallel?

Overall brightness (not individual bulbs' brightness) will increase when we connect them in parallel & it will decrease when we connect them in series.


What happens to the voltages across the light bulbs in a parallel circuit change as more light bulbs are added to the circuit?

nothing


What happens to the brightness of the light bulbs in a series with a heater?

They dim as the total resistance of series of resistances is the sum of the resistances; and current = V/R.


How are light bulbs measured?

Brightness of a light bulb depends on the power, current, resistance and size of the filament. Lumens is the unit of measurement for the brightness of a bulb. A bulb has more brightness if there is more power and current. Greater the resistance, less is the brightness.


What is the value of resistor do you use in 2.5volts bulb with use 4 batteries with 1.5volts?

If your batteries were in series the total voltage would be 6 volts, and it the bulbs were in series you would need a resistor to keep them from burning out. In order to know how many ohms the resistor would need to be you would have to know the wattage of the bulbs, or the resistance of the bulbs. If you don't know the best thing to do is use a variable resistor. Then you can adjust it or the brightness that you want.


How do you convert a German 220 volt chandelier to USA 110 volt?

If you want mood lighting just connect it as is, the brightness of the bulbs will be half. If you want full brightness change the bulbs to 120 volt with bulbs of the same wattage as the 220 volt bulbs.


What happens to the voltage as more bulbs are added in series?

The total voltage should not change in this case.


What happens to a parallel circuit if more bulbs are added?

Total power consumption increases with each bulb. The remaining bulbs continue to operate unchanged.