To calculate the effective resistance of the circuit in the image, we can use the following steps:
1. **Identify the resistors that are connected in parallel.**
In this circuit, the following resistors are connected in parallel:
* 2.2 Ω
* 21 Ω
* 24 Ω
2. **Calculate the effective resistance of the parallel resistors.**
To calculate the effective resistance of parallel resistors, we can use the following formula:
```
1/R_eff = 1/R_1 + 1/R_2 + 1/R_3 + ...
where:
* R_eff is the effective resistance of the parallel resistors
* R_1, R_2, and R_3 are the resistances of the individual parallel resistors
Substituting the values from the circuit into the formula, we get:
1/R_eff = 1/2.2 + 1/21 + 1/24
R_eff = 1.63 Ω
3. **Calculate the total resistance of the circuit.**
The total resistance of the circuit is the sum of the effective resistance of the parallel resistors and the resistance of the 20 Ω resistor.
R_total = R_eff + 20 Ω
R_total = 21.63 Ω
Therefore, the effective resistance of the circuit is **21.63 Ω**.
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Answers & Comments
To calculate the effective resistance of the circuit in the image, we can use the following steps:
1. **Identify the resistors that are connected in parallel.**
In this circuit, the following resistors are connected in parallel:
* 2.2 Ω
* 21 Ω
* 24 Ω
2. **Calculate the effective resistance of the parallel resistors.**
To calculate the effective resistance of parallel resistors, we can use the following formula:
```
1/R_eff = 1/R_1 + 1/R_2 + 1/R_3 + ...
```
where:
* R_eff is the effective resistance of the parallel resistors
* R_1, R_2, and R_3 are the resistances of the individual parallel resistors
Substituting the values from the circuit into the formula, we get:
```
1/R_eff = 1/2.2 + 1/21 + 1/24
```
```
R_eff = 1.63 Ω
```
3. **Calculate the total resistance of the circuit.**
The total resistance of the circuit is the sum of the effective resistance of the parallel resistors and the resistance of the 20 Ω resistor.
```
R_total = R_eff + 20 Ω
```
```
R_total = 21.63 Ω
```
Therefore, the effective resistance of the circuit is **21.63 Ω**.