elp 23. Electrical Trades Ohm's law is often written in the form 1 = R where I is the current in amperes (A), E is the voltage, and R is the resist- ance in ohms. What is the voltage necessary to push a 0.80-A current through a resistance of 450 ohms? 24. Aviation The formula D = RT is used to calculate the distance D traveled by an object moving at a con- stant average speed R during an elapsed time 7. How long would it take a pilot to fly 1240 miles at an average speed of 220 mph