To answer this question, a few steps need to be taken first.

In the diagram, the two resistors are arranged in a row.

This proves that the same current flows through each resistor.

Thus, it can be identified that the circuit is a series circuit.

For series circuit, the formula used to calculate the effective resistance is as follows:

\(\begin {aligned} R_T &= R_1 + R_2 \\ &= 15 + 10 \\ &= 25 \space \Omega. \end {aligned}\)

Step 3: Calculate the current for the circuit

Since the current through the resistor in the circuit is the same, the formula \(V_T = IR_T\) is used as follows:

\(\begin {aligned} V_T &= IR_T \\ \dfrac {V_T}{R_T} &= I \\ I &= \dfrac {V_T}{R_T} \\ &= \dfrac {120}{25} \\ &= 4.8 \space \text A. \end {aligned}\)

Menerusi rajah, kedua-dua perintang disusun dalam satu baris.

Hal ini membuktikan arus yang sama mengalir menerusi setiap perintang.

Maka, dapat dikenal pasti bahawa litar tersebut merupakan litar sesiri.

Bagi litar sesiri, rumus yang digunakan bagi menghitung rintangan berkesan adalah seperti berikut:

\(\begin {aligned} R_T &= R_1 + R_2 \\ &= 15 + 10 \\ &= 25 \space \Omega. \end {aligned}\)

Oleh kerana arus yang melalui perintang dalam litar sesiri adalah sama, maka rumus \(V_T = IR_T\) digunakan seperti berikut:

\(\begin {aligned} V_T &= IR_T \\ \dfrac {V_T}{R_T} &= I \\ I &= \dfrac {V_T}{R_T} \\ &= \dfrac {120}{25} \\ &= 4.8 \space \text A. \end {aligned}\)

To answer this question, a few steps need to be taken first.

In the diagram, the two resistors are arranged in a row.

This proves that the same current flows through each resistor.

Thus, it can be identified that the circuit is a series circuit.

For series circuit, the formula used to calculate the effective resistance is as follows:

\(\begin {aligned} R_T &= R_1 + R_2 \\ &= 15 + 10 \\ &= 25 \space \Omega. \end {aligned}\)

Step 3: Calculate the current for the circuit

Since the current through the resistor in the circuit is the same, the formula \(V_T = IR_T\) is used as follows:

\(\begin {aligned} V_T &= IR_T \\ \dfrac {V_T}{R_T} &= I \\ I &= \dfrac {V_T}{R_T} \\ &= \dfrac {120}{25} \\ &= 4.8 \space \text A. \end {aligned}\)