Each of us is a small power station. Our nervous system is an “electric circuit” that constantly sends millions of visual, tactile and auditory stimuli in the form of electrical impulses to our “central unit” – the brain. The brain then processes these electrical impulses so that we can see, hear, taste, smell and sense heat, cold and pain. In return, the brain transmits appropriate electrical impulses back to our body to control it. Thanks to electrical impulses our heart beats! We can consciously walk, run, paint, and jump. Whether we like it or not, our January hero – the ampere – is always within us!
The fact that each of us is “charged with current” can be particularly useful in medicine, and especially in diagnosing diseases or administering lifesaving treatments. When our heart stops, for example, we use a defibrillator – a piece of equipment that delivers a dose of electric current to the heart. In heart diagnostics we commonly use electrocardiograph (EKG), which is no more than a very sensitive current measuring instrument. EKG records, analysed by specialists in cardiology, is a powerful tool that can reveal a lot about the condition of a heart.