Explain why the National Grid uses step-up and step-down transformers.

Step-up transformers are used at power stations to produce the very high voltages needed to transmit electricity through the National Grid power lines. These high voltages are too dangerous to use in the home, so step-down transformers are used locally to reduce the voltage to safe levels.

second mirror gathers light from a faraway object and reflects it to another mirror. - a.

d eras and periods