I'm trying to learn a bit more about forward voltage and OHM's Law but I'm not sure how to wire this circuit.
I have: 1 x 4.5 DC motor (Operating Volts: 1.5- 4.5V, Nominal Volts: 4.5V, Current (no load): 0.25A) - http://www.jaycar.com.au/Electromechanical-Components/Mechatronics/Motors-%26-Gearboxes/Hobby-Motor---Medium-Torque/p/YM2707
3 x 5mm LED (IF Typical (mA)20, IF Max Continuous (mA)50, VF Typical (V)2.1) - http://www.jaycar.com.au/Active-Components/Optoelectronics/Standard-LEDs/LED-5mm-Red-Waterclear-10000mcd/p/ZD0156
1 x 3 - 12VDC Switchmode Plugpack (Output voltage: 3, 4.5, 5, 6, 7.5, 9, Output current: 1000mA (max))
Do I use the power at 4.5V and run the motor and the LEDs in parallel?
Do I need resistors on the LEDs?
Any help will be greatly appreciated!