Which piece of equipment would you use to measure the current in a circuit?

You would use an ammeter to measure the current in a circuit. Here are the steps:

1. First, ensure the circuit is off or disconnected from any power source. This is to prevent any electrical shock or damage to the equipment.

2. Connect the ammeter in series with the circuit. This means you need to disconnect a wire in your circuit where you want to measure the current, and then connect one probe of the ammeter to one end of the disconnected wire, and the other probe to the other end.

3. Once the ammeter is connected, you can turn on or reconnect the power source to the circuit.

4. The ammeter will then display the current flowing through that part of the circuit.

Remember, safety first when dealing with electrical circuits. Always make sure the circuit is off before making any adjustments or connections.