Answer:
1.) The second industrial revolution had begun! Electricity moved into many areas such as industry, railway transport, street lighting before it went into homes. In the 1920s, the rapid expansion of electricity made it possible for electricity networks to be established in industrial countries.
2.)The technological changes included the following: (1) the use of new basic materials, chiefly iron and steel, (2) the use of new energy sources, including both fuels and motive power, such as coal, the steam engine, electricity, petroleum,etc.
3.)Electricity was one of the main sources of moving forward and advancing in the Second Industrial Revolution.Little did they know, those simple experiments would become revolutionary and improve the daily life of individuals. Energy~ Before electricity was introduced, many industries were powered by steam machines.