### Examples of series and parallel resistance calculations

Several resistors are connected in series to pass the same current, the voltage across each resistor is equal to the current through the resistor multiplied by the resistance value of the resistor, and the current is equal to the total voltage of 20v divided by the total resistance (the sum of the three resistors 300+150+100)550 ohms is slightly equal to 0.036a, several resistors are connected in series to share the voltage, and their current through the same; several resistors are connected in parallel to share the voltage; several resistors are connected in parallel to share the current, and their voltage through the resistor remains unchanged. In the circuit several resistors are connected in series in order to divide the voltage, and the current through them remains the same; in the circuit several resistors are connected in parallel in order to divide the current, and the voltage across the resistors remains the same.

The relationship between current, resistance, and voltage can be calculated using Ohm’s law i (current) = u voltage/r resistance.

### A few circuit questions to find the equivalent resistance (please include the steps to answer or analyze)

1. According to the parallel resistance calculation, the final result: Rab = 1

2. When the current is in the xy direction, there is no current in the middle resistor, according to the series-parallel way of calculating: Rxy/Rgh = 2

3. According to the bridge, there is no current in the series resistor in the upper right and lower left. Rpq=R

4. Pulling the middle resistor out will clearly give: Rzh=0.5

### Parallel Resistance Calculation Assuming 4 resistors in parallel as shown in the diagram each resistor is 10K R total = ?

If the resistors are the same and there are n identical resistors in parallel then r total = r/n. This derivation is very easy to prove, just do the proof yourself and bring in the values to get the answer 2.5k

### A simple physics counting series-parallel resistance question, as shown

The questioner should be a middle school student~This kind of circuit is not very common in middle and high school, and I’ll give you an idea of the equivalent method of this kind of circuit:

In your question, it should be written like this:

Last R:

Looking for the acceptance!