1 State Ohm's law in words.

4.1 State Ohm's law in words.
Ohm's law states that the current flowing through a conductor between two points is directly proportional to the voltage across the two points, and inversely proportional to the resistance between them, provided the temperature and other physical conditions remain constant.

4.2 Calculate the reading on ammeter $A_1$.

Step 1: Calculate the voltage across the $8 \, \Omega$ resistor.

$$V_{8\Omega} = I_{8\Omega} \times R_{8\Omega} = 0.5 \, A \times 8 \, \Omega = 4 \, V$$

Step 2: Calculate the current through the $16 \, \Omega$ resistor. Since the $8 \, \Omega$ and $16 \, \Omega$ resistors are in parallel, the voltage across them is the same.

$$I_{16\Omega} = \frac{V_{16\Omega}}{R_{16\Omega}} = \frac{4 \, V}{16 \, \Omega} = 0.25 \, A$$

Step 3: The reading on ammeter $A_1$ is the total current flowing out of the parallel combination of $8 \, \Omega$ and $16 \, \Omega$ resistors.

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