Amps is the amount current being pushed through a circuit
Volts is how hard the current is being pushed through the current.
Ohms is the amount of resistance inside the current.
More ohms or more Amps necessitates more Volts
Bonus: watts is the rate at which the current is moving through the circuit. Volts squared divided by ohms equals watts. Amps squared times ohms equals watts. Volts times amps equals watts.