I'm helping my brother (8) build a small toy car powered by a tiny 3V motor that we have at home. Most tutorials we've found on the internet suggest using a 9V battery, but never specify the voltage of motor they're using.
As I only have basic and theoretical knowledge in electronics, I'm assuming I should power the motor with equal voltage (3V). Could I use a couple of AAA batteries in series (which, frankly, I have no idea how to do except maybe use electrical tape to hold them together) to do power the motor? Would it be enough? Should we use the 9V battery instead?
I'm just... trying to make sure we don't hurt ourselves or burn the house down.