Voltage is the punch behind the force of the current. If you push on your fridge door with everything you have, you will budge the fridge, but never leave a dent. That's high current, low voltage. Now punch the fridge. The mass of your fist is much smaller than the combined weight of your body, yet you will easily leave a dent. That's high voltage, low current. Of course, with enough body mass and power behind the punch, you'd not only dent the fridge, but move it also. High voltage, high current.