Such relays are used to switch low-voltage signals (one volt or less). An ohm is equivalent to a volt per ampere. The system is a set of two devices running on 7.5 volt batteries. The refrigerator was a SunFrost high efficiency refrigerator run by the 24 volt battery bank. Most PMOS integrated circuits require a power supply of 17-24 volt DC. They often have a plug for the 12 volt power jack in cars. The FJR1300 has a standard 12 volt, negative ground electrical system. The power output is supplied by 750 volt direct current through third rail. The plug-in hybrid uses a similar powertrain as the current Chevrolet Volt (second generation). The electrical system is changed to the 24/12 volt military standard. The all-electric range was officially rated at , up from attained by the 2015 Volt. The Voltec is a home-charging unit built by SPX for Volt owners. These connectors are designated as 24 volt. Available as 120 volt model for the North American market. Vehicles such as the Chevrolet Volt and Toyota Prius are also available.