An ammeter for current in a circuit should be placed where?

An ammeter for current in a circuit should be placed where?

• A. In parallel with the component
• B. In series with the component whose current you want to measure
• C. Across the power supply
• D. Anywhere in the circuit

Answer: (B)

To measure current through a particular component, you want the same current to flow through the meter as through that component. In a single-loop circuit, current is the same everywhere along that loop, so you place the ammeter in series with the component. This way the component and the meter share the same current, and the meter’s small resistance minimally disturbs the circuit. If the ammeter were placed in parallel with the component, it would create a new path of very low resistance. Most of the current would flow through the ammeter instead of the component, giving a misleading reading and potentially altering the circuit. Placing the ammeter across the power supply would measure the total current drawn from the supply, not the current through the specific component, which isn’t what you want. Placing it anywhere in the circuit isn’t reliable either, because unless it’s in the same series path as the component, it won’t guarantee the same current flows through both. So the correct approach is to insert the ammeter in series with the component whose current you want to measure.

To measure current through a particular component, you want the same current to flow through the meter as through that component. In a single-loop circuit, current is the same everywhere along that loop, so you place the ammeter in series with the component. This way the component and the meter share the same current, and the meter’s small resistance minimally disturbs the circuit.

If the ammeter were placed in parallel with the component, it would create a new path of very low resistance. Most of the current would flow through the ammeter instead of the component, giving a misleading reading and potentially altering the circuit.

Placing the ammeter across the power supply would measure the total current drawn from the supply, not the current through the specific component, which isn’t what you want.

Placing it anywhere in the circuit isn’t reliable either, because unless it’s in the same series path as the component, it won’t guarantee the same current flows through both.

So the correct approach is to insert the ammeter in series with the component whose current you want to measure.