![]() ![]() In a series circuit, all of the voltages across all of the individual series components will equal the power supply voltage. Voltage across the resistor = 5.333 volts Voltage across the resistor = resistor's resistance*current flow through resistor To reduce the possibility of getting confused, calculate the voltage across the single resistor first. Now we can find the voltage across the individual components. We also know that the 500 ohm resistor in series with the 400 ohm resistor is equal to a 900 ohm resistor.Ĭurrent flow through circuit = voltage across circuit/total circuit resistanceĬurrent flow through circuit = 0.0133 amps We know that we have a 12 volt power source. Now that we have, esentially, one 500 ohm resistor in series with a 400 ohm resistor, we can calculate the total current through the circuit. Now that we know that the parallel resistors are equal to a single 500 ohm resistor. Total resistance of parallel resistors = 333.33. Total resistance of parallel resistors = 1000/3 If we had 3 parallel resistors, we'd divide 1000 by 3 to find the total resistance of the parallel resistors. Total resistance of parallel resistors = 500 ohms Total resistance of parallel resistors = 1000/2 Total resistance of parallel resistors = resistance of a single component/number of resistors For this parallel network, we have two 1000 ohm resistors. For a simple circuit with two equal value resistors, we can simply divide the resistance of a single component by the total number of components. This means we need to find the total resistance of the parallel network. To calculate the total current, we should first simplify the circuit. We also know that the total current flow through the two parallel connected resistors will equal the current flow through the 400 ohm resistor. We know that the voltage across the two 1000 ohm resistors is going to be the same (because they're connected in parallel). In the following circuit, you can see that there are two 1000 ohm resistors in series with a single 400 ohm resistor. In a parallel circuit, the 'voltage' is the same across each device. As was said before, in a series circuit, the 'current' in each device is the same. This section will show you what happens to the voltage, current and power dissipation in a series/parallel circuit. In the diagrams/text above, we had either series OR parallel circuits. I've seen it happen, especially when the amplifier was improperly fused. ![]() This means that if you connect too many speakers, in a parallel wiring configuration, to an amplifier (the power source in this case) it may well be damaged beyond repair. When making any connections to any power source you must know the limits of the source, to prevent damage to the source. You can see that four speakers draws twice as much current from the amplifier than the two speaker configuration. In the 2 diagrams below, you can see the relationship between the current flow out of the amplifier and the number of speakers. If devices are added to the power source in a parallel configuration, the current demand/flow from the power source increases. The amount of current flowing through each device is dependent on the impedance/resistance of that particular device. This means that each device receives the same voltage. In a parallel circuit (like the two examples above), each device is directly connected to the power source. When adding more components in a series circuit, the current flow decreases, if the applied voltage remains constant. ![]() The voltage across each device depends on its impedance/resistance of each device and the current flowing through the circuit. ![]() This means that the rate of current flow through all devices is the same. In a series circuit (like the two above), the current must flow through one device to get to the next device. But we'll cover that on an upcoming page. speakers to an amplifier), series and parallel. There are 2 ways to connect multiple devices to a power source (e.g. Series vs Parallel Electrical Connections ![]()
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