Express which of the following set ups can be used to verify
ohm's law?

Options

A.
B.
C.
D.

Explanation

To verify Ohm's Law, we need to set up a circuit that allows us to measure the current flowing through a resistor and the voltage across that resistor. Here’s a step-by-step solution to identify the correct setups for verifying Ohm's Law:

### Step 1: Understand Ohm's Law
Ohm's Law states that the current (I) through a conductor between two points is directly proportional to the voltage (V) across the two points, provided the temperature remains constant. The mathematical expression is:
\[ V = I \cdot R \]
where \( R \) is the resistance.

### Step 2: Identify the Components Needed
To verify Ohm's Law, we need:
- A resistor (R)
- A voltage source (battery)
- An ammeter (to measure current)
- A voltmeter (to measure voltage)

### Step 3: Connect the Circuit
1. **Connect the Resistor**: Place the resistor in the circuit.
2. **Connect the Battery**: Connect the battery in series with the resistor.
3. **Connect the Ammeter**: Connect the ammeter in series with the resistor to measure the current flowing through it.
4. **Connect the Voltmeter**: Connect the voltmeter in parallel with the resistor to measure the voltage across it.

### Step 4: Analyze the Setups
Now, let’s evaluate the given setups:
- **Setup 1**: Battery connected to a resistor with the ammeter in series and the voltmeter in parallel. **(Correct)**
- **Setup 2**: Battery connected to a resistor with the voltmeter in series with the resistor. **(Incorrect)**
- **Setup 3**: Both the voltmeter and ammeter connected in parallel. **(Incorrect)**
- **Setup 4**: No voltmeter or ammeter arrangement. **(Incorrect)**

### Step 5: Conclusion
The only correct setup that can be used to verify Ohm's Law is the first one, where the ammeter is in series with the resistor and the voltmeter is in parallel with the resistor.