Module 4A Film Fest Electricity everywhere brass holder All ordinary electrical phenomena depend on forces between electrical charges carried by protons and electrons Protons contain the positive charges and electrons contain the negative charges Mankind began to understand electricity from simple observation of natural phenomena In the past 100 years or so, man learnt how to harness and use electricity This brought about a drastic transformation in all industrial societies Photocopiable © Ediciones Santillana S.A / Richmond 2011 Electricity is a form of energy that occurs everywhere in nature: in space, in the atmosphere, in atoms and molecules In animals, including man, weak electrical impulses are transmitted from one nerve cell to the next, and they provide signals for the brain and other parts of the body Electric power runs electric motors in factories, provides street lighting in cities and runs appliances and lights in homes It also plays an important role in many industrial processes, such as the electric arc welding of metals turbine brushes side contact conductor base brass cap glass mount wires to ouside circuits S conductor hook glass bulb filament ring N magnetic field Thomas Alva Edison (1847 - 1931) invented the electric light bulb Which were his other famous inventions? argon Activities Choose the correct option a Electricity occurs everywhere in nature .in all human cells .in every industrial process b It provides street lighting .electric nerves .signals for the atmosphere c Protons contain the neutral charges .the positive charges .the negative charges English Toolkit - Technology Module 4A 2 Match each expression with its definition a system in which all the conductors and apparatus are electrically connected to a common source of electromotive force a type of oscillograph that visually displays an electrical wave on a fluorescent screen a source of electricity, especially one that transforms mechanical or heat energy into electric energy a battery of electromechanical cells for generating electric current part of an electric lamp condenser a electric generator b light bulb c capacitor d oscilloscope e storage battery f electrical system 3 In your notebook, write a short description of this diagram fuel electric transformer steam generator steam turbine plant transportation substation home user comercial user industrial user Photocopiable © Ediciones Santillana S.A / Richmond 2011 138,500 765,000 V 12,500 25,000 V 120 V 120 V 12,500 V 34,000 V 600 V street lights distribution transformer 4 Ask questions for these answers a ? d Energy occurs everywhere in nature b ? It provides street lighting in cities c  ? It depends on forces between electrical charges ? In protons and electrons e ? It drastically transformed all industrial societies f  ? From simple observation of natural phenomena 5 Translate the definitions in activity a b c  d e f English Toolkit - Technology