Amrita is trying to set-up an electric circuit. She runs short of connecting wires. Which of the following materials can she use to complete the circuit?

To complete an electric circuit, a conductor of electricity is needed. Steel wire is a metal and a good conductor of electricity, so it can be used in place of connecting wires. Thick thread, glass rod, and rubber pipe are all insulators—they do not allow electric current to pass through. Hence steel wire is the correct choice.