Mark out the correct options

Options

A. (a)An ammeter should have small resistance
B. (b)An ammeter should have large resistance.
C. (c )A voltmeter should have small resistance
D. (d)A voltmeter should have large resistance

Answer

To solve the question regarding the characteristics of ammeters and voltmeters, let's analyze the options step by step.

### Step-by-Step Solution:

1. **Understanding the Function of an Ammeter**:
- An ammeter is used to measure the current flowing through a circuit. It is connected in series with the circuit component whose current is to be measured.
- For accurate current measurement, the ammeter must not significantly affect the total resistance of the circuit.

**Conclusion**: An ammeter should have **small resistance** to minimize its impact on the circuit.

2. **Analyzing the Options for Ammeter**:
- **Option 1**: "An ammeter should have small resistance." - This is **correct**.
- **Option 2**: "An ammeter should have large resistance." - This is **incorrect**.

3. **Understanding the Function of a Voltmeter**:
- A voltmeter measures the potential difference across a component and is connected in parallel with that component.
- For accurate voltage measurement, the voltmeter should not draw significant current from the circuit, which would alter the voltage across the component.

**Conclusion**: A voltmeter should have **large resistance** to ensure it does not affect the circuit.

4. **Analyzing the Options for Voltmeter**:
- **Option 3**: "A voltmeter should have small resistance." - This is **incorrect**.
- **Option 4**: "A voltmeter should have large resistance." - This is **correct**.

5. **Final Conclusion**:
- The correct options are:
- **Option 1**: An ammeter should have small resistance (Correct).
- **Option 4**: A voltmeter should have large resistance (Correct).

### Summary of Correct Options:
- **Correct Options**: 1 and 4.