# Relationship between current power and electrical energy used by electric appliances

### BBC - GCSE Bitesize: Energy in circuits

Learn how energy is used in the home and how much it costs with BBC Bitesize The table shows the typical power ratings of some electrical appliances, listed . Calculation of Electrical Energy. Energy. On-page we dealt with power arid The formula that links energy and power is: If we know the power in watts of an appliance and how many seconds it is used we can Calculate the heat produced by an electric iron, which has a resistance of 30 ohms and takes a current. To calculate the consumption of electrical appliances in kWh, you have to take into account the capacity and the length of use. As an example, we calculate the annual energy consumption of a radio. giving the consumption of the most common electrical household appliances How much power does an electric car use?.

- Мне наплевать, даже если ваш ТРАНСТЕКСТ взлетит на воздух.

Эту проклятую машину так или иначе следует объявить вне закона. Стратмор вздохнул. - Оставь эти штучки детям, Грег.