<P> Series circuits were formerly used for lighting in electric multiple unit trains . For example, if the supply voltage was 600 volts there might be eight 70 - volt bulbs in series (total 560 volts) plus a resistor to drop the remaining 40 volts . Series circuits for train lighting were superseded, first by motor - generators, then by solid state devices . </P> <P> Series resistance can also be applied to the arrangement of blood vessels within a given organ . Each organ is supplied by a large artery, smaller arteries, arterioles, capillaries, and veins arranged in series . The total resistance is the sum of the individual resistances, as expressed by the following equation: R = R + R + R . The largest proportion of resistance in this series is contributed by the arterioles . </P> <P> Parallel resistance is illustrated by the circulatory system . Each organ is supplied by an artery that branches off the aorta . The total resistance of this parallel arrangement is expressed by the following equation: 1 / R = 1 / R + 1 / R +...1 / R. R, R, and R are the resistances of the renal, hepatic, and other arteries respectively . The total resistance is less than the resistance of any of the individual arteries . </P>

Is there more current in a series or parallel circuit