Worksheet 8B - MATHS

Activity 2: Group Work

Study the table below. If the values for the Voltage (V) and the Current (I) for your circuit were as indicated below, answer the questions that follow:

[tex]\[
\begin{tabular}{|l|l|l|l|l|l|}
\hline
Voltage (V) & 4 & 8 & 12 & 16 & 20 \\
\hline
Current (I) & 0.4 & 0.8 & 1.2 & 1.6 & 2.0 \\
\hline
\end{tabular}
\][/tex]

(Note: The original table had missing values for Current, which have been filled in as a logical progression based on the voltage values.)



Answer :

Certainly! Let's work through this step-by-step to understand the relationship between Voltage (V) and Current (I) for the given circuit, and to complete the missing values in the table.

### Step-by-Step Solution:

1. Identify the given values:
- Voltage (V): 4V, 8V, 12V, 16V, 20V
- Current (I): 0.4A, 0.8A, 1.2A, ?, ?

2. Understand the relationship:
We assume a linear relationship between Voltage (V) and Current (I), which means [tex]\( V = I \times R \)[/tex], where [tex]\( R \)[/tex] is the resistance.

3. Calculate the resistance:
- Using the first data point (V = 4V, I = 0.4A):
[tex]\( R = \frac{V}{I} = \frac{4 \text{V}}{0.4 \text{A}} = 10 \Omega \)[/tex]

- Using the second data point (V = 8V, I = 0.8A):
[tex]\( R = \frac{V}{I} = \frac{8 \text{V}}{0.8 \text{A}} = 10 \Omega \)[/tex]

- Using the third data point (V = 12V, I = 1.2A):
[tex]\( R = \frac{V}{I} = \frac{12 \text{V}}{1.2 \text{A}} = 10 \Omega \)[/tex]

- As we can see, the resistance [tex]\( R \)[/tex] is consistent across these data points and is equal to 10 Ohms.

4. Calculate the missing current values:
- For V = 16V:
[tex]\( I = \frac{V}{R} = \frac{16 \text{V}}{10 \Omega} = 1.6 \text{A} \)[/tex]

- For V = 20V:
[tex]\( I = \frac{V}{R} = \frac{20 \text{V}}{10 \Omega} = 2.0 \text{A} \)[/tex]

5. Complete the table:

\begin{tabular}{|l|l|l|l|l|l|}
\hline
Voltage (V) & 4 & 8 & 12 & 16 & 20 \\
\hline
Current (I) & 0.4 & 0.8 & 1.2 & 1.6 & 2.0 \\
\hline
\end{tabular}

### Conclusion:
The calculated resistance [tex]\( R \)[/tex] is 10 Ohms, and the current values for the missing points are 1.6 Amps for 16V and 2.0 Amps for 20V. This completes our table and confirms that the relationship between Voltage and Current for this circuit is linear with a constant resistance of 10 Ohms.