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Both ends of the battery are connected, to make a complete circuit.
Because without both ends connected there can not be a flow of electrons from one end of the battery to the other.
There are two circuits on the battery and motor. One wire is take which have four ends. The wire is connected on the desired circuits.
It may do this if you have the leads to the meter connected to the wrong ends of the battery.
You would short out the battery. If it was a car battery capable of 300 amps and the wire was big enough, the battery could explode.
This would be an Electromagnet...... If the battery is disconnected, then the iron bar will become a permanent magnet.
An electromagnet is a device that produces a magnetic field with the use of DC electricity. A simple electromagnet has a coil of wire wrapped around an iron core. A simple experiment would be to wrap a copper wire around an iron nail then connect both ends of the wire to a small battery. You will notice the nail is magnetized as long as the battery is connected.
For current to flow through the lamp, there must be a potential difference (voltage) applied across opposite ends of that lamp.
An electromagnet is a device that produces a magnetic field with the use of DC electricity. A simple electromagnet has a coil of wire wrapped around an iron core. A simple experiment would be to wrap a copper wire around an iron nail then connect both ends of the wire to a small battery. You will notice the nail is magnetized as long as the battery is connected.
The circuit won't do anything until both terminals of the battery are connected to the correct [two different] points in the circuit. As long as either terminal of the battery remains disconnected, the circuit is "OFF".
Look at where the battery is placed and you'll see one square with a piece that has three ends right to the left of the battery. This is the start of the circuit and this piece has to be placed so one end is connected to the battery and the other ends are point up and down. From there, the rest of the circuit should be pretty easy to figure out. Good luck! :)
Circle