ABSTRACT
After reading the following chapter and undertaking personal study, you should be able to:
Describe magnetism and distinguish between permanent magnets and electromagnets.
Give examples of the use of magnets in health care.
Distinguish between static and dynamic (current) electricity.
Explain the terms ‘potential difference’, ‘current’, ‘resistance’ and ‘power’ and identify the units used to measure each.
Briefly describe the effects of electrocution and distinguish between macroshock and microshock.
Identify important aspects of electrical safety.
Describe the action potential and relate this to nerve cells and the conduction system of the heart.
Briefly describe important medical uses of electricity, including the ECG monitor, the defibrillator, diathermy and the artificial pacemaker.
