A dangerous servant. One evening,Daisy said 'I'm going to the shop to buy a packet of sweets. Does anyone want anything? 'Benny,Daisy's brother said,'Yes. Can you get me a packet of electricity,please?'Daisy said, 'Right,'and went out.Benny laughed,'Ha!Ha!I've tricked Daisy at last. She doesn't even know what electricity is. She thinks you can buy it in packets,like sweets!She'll really look foolish.' Mum said,'Do you know what electricity is?' Benny said,'Yes.Electricity flows through a wire. A meter measures the amount you use,and you get a bill for it monthly. It's like water,in a way.''That's not a bad explanation,'said Dad, 'although electricity is much more dangerous than water. Electricity is a good servant,but a dangerous one. You must always be careful with it. Can you tell me what it looks like?'Benny scratched his head. Dad said,'Nobody's ever seen electricity.It's invisible. But we can change it into forms of energy that we can see,hear or feel.