Answer: Although the stall current is 5V/10-Ohms = 0.5A, the worst case for the H-bridge is 1A. The worst case occurs where the motor is powered and rotating freely at maximum speed in one direction, then the H-bridge suddenly switches polarity of the supply voltage. In this case, the motor becomes a generator, producing close to 5V. The generated 5V is added to the supply voltage, another 5V, to produce a total of 10V. Consequently, the amount of current passing through the supply terminals, H-bridge and the coil is 10V/10-Ohms = 1A.

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