The primary benefit of connecting light bulbs in parallel rather than series is that when one burns out, the other remains lighted. Parallel circuits are branching and give more than one channel for electrical current (electrons) to go through. This allows for multiple lights to be on at once.
When you connect light bulbs in series, only one will glow while the others are off. A series circuit is easy to understand because it "ties" all the lights off together in one place. If one bulb in a series circuit breaks, then all the others still receive electricity and so they too will burn out soon.
In conclusion, connecting lamps in series can be dangerous because if one bulb goes out then all of them will too. This could cause an electric shock or even start a fire. Light bulbs degrade over time and will eventually burn out. It's best to replace them before they fail so that you don't expose yourself or others to danger.
However, when you connect lamps in parallel they can stay on even after one bulb burns out because there are now two channels instead of one for electricity to flow through. This means that even if one bulb burns out another will still be able to shine its light.
This arrangement also protects against electric shocks because if one bulb were to break down then the remaining ones would still be safe.
Parallel circuits have the apparent benefit of not affecting the other lights in the circuit if one bulb burns out or is removed. They continue to operate because each of the other loads still has a distinct, independent closed channel from the source. If any one of these channels becomes blocked (for example, by dirt entering the fixture), current will flow through the remaining open channels, lighting all the bulbs in the circuit.
The only way to ensure that only one bulb remains on when more than one is plugged in is with a series circuit. A series circuit uses only one conductor to supply power and requires that all the plugs into which it is plugged be inserted simultaneously for the circuit to be activated. If some of the plugs are removed from a series circuit without first removing the plug from the source, then current will still flow through those parts of the circuit already established until either a break occurs or all the plugs are removed.
Bulbs are designed to be easy to install and remove. This is good practice for several reasons. First, it ensures that you use proper wiring techniques which can reduce the risk of electrical shock. Second, it helps to prevent the accumulation of dust inside the fixtures which may cause your bulbs to burn out prematurely. Last, it makes replacing burned-out bulbs easier since no wrenches are needed to connect or disconnect them.
Two lights in a simple parallel circuit each receive the entire battery voltage. As a result, the parallel circuit's bulbs will be brighter than those in the series circuit. Another advantage of parallel circuits is that if one loop is unplugged, the other is still powered. In a series circuit, if one bulb goes out, then so does the whole string.
In practice, lights in series with resistors are used because it is easier to adjust the brightness of several lamps than it is to adjust one lamp and its resistor combination. Also, lights in parallel without any resistors connected to them will suffer from voltage fluctuations on the power line and emit a flickering light. Flickering lights are not acceptable in many applications such as when driving down the street or during photosynthesis. A resistor can be placed in parallel with several lamps to reduce the current through each one of them. This allows you to control the intensity of each lamp in a way that isn't possible with only two wires coming out of each fixture.
Finally, lights in series require more space between fixtures than those in parallel. If you want to light up a large area, you'll need to keep some room between parallel loops or connect each loop to one side of a transformer. The more lamps you have connected in series, the harder it will be to reach across the room for something else.
Both bulbs are connected in parallel and have the same voltage across them. The bulb with the lowest resistance will conduct more current, resulting in more power dissipation and brightness. The majority of residential electrical wiring lights are connected in parallel. This means that all lights can be turned on at once without exceeding the maximum line voltage of 120 volts or the maximum load of approximately 15 watts per circuit.
So, depending on which bulb is better insulated or not, it will give out lightest or darkest.
If you were to connect both bulbs in series instead, only the highest-resistance bulb would glow while the other would be extinguished. Series connections are used when one bulb fails; the remaining healthy bulb will not emit light. For example, if one bulb in a pair burns out, its current will stop flowing and neither bulb will work anymore. However, if both bulbs are connected in series, then only one bulb can burn out at a time because the total current flow is through both bulbs.
So, connecting lamps in series will extinguish all but one of them while connecting them in parallel will allow all lamps to remain lit.
The rule for how many amps each lamp should be able to handle is based on its wattage: Amp ratings should be equal to wattage divided by 1,000.