New PDF release: Business and Law for the Shipmaster

By Frederick Neville Hopkins

ISBN-10: 0851745377

ISBN-13: 9780851745374

A latest finished reference masking registry, type, group issues, carriage of passengers and items, marine coverage, drawback of legal responsibility, and lots more and plenty extra.

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Extra info for Business and Law for the Shipmaster

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If we measure the voltage across a resistor in volts (V) and the current through the resistor in amps (A), then the resistance is in units of ohms (Ω). Using the Greek letter omega for ohms avoids the confusion that would be inevitable if we used a capital letter O. Definition A resistor is used to control current or to convert a wave of current into a wave of voltage, using the I = V/ R or V = RI relationship. Every part of a circuit has some resistance to the flow of current, and when we specify a resistor as a circuit component we mean a component that is manufactured to some precise (or reasonably precise) value of resistance and used to control the amount of current flowing in some part of a circuit.

The important features of a waveform are its frequency, the number of times a wave repeats per second, and its amplitude, the height of the wave. Sinewaves are used mainly in radio applications, but other waveshapes such as square and sawtooth waves are used, particularly where timing is important. Pulses The pulse is a waveform, but one that you might not recognize as a wave because the time of the pulse is very short compared to the time between pulses. 11 illustrates three different pulse shapes, all of which share a very sharply rising portion, the leading edge.

The difference is that for changing voltages and currents we need to multiply by another factor as well; we will look at that later when we deal with RMS quantities and phase angles. Alternating Voltage The voltage (EMF) that is generated by a cell or battery is truly steady, but the voltage from a rotating generator is not. When one side of the revolving coil of wire is approaching a pole of the magnet, the changing voltage is in one direction, but as the wire moves away from the magnetic pole, the changing voltage is in the other direction.

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Business and Law for the Shipmaster by Frederick Neville Hopkins


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