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[Music] hi and welcome back to three science lessons co uk by the end of this video you should be able to describe whats meant by resistance you should then be able to calculate resistance in a circuit now over the last few videos weve seen that electricity involves the transfer of energy in an electric circuit the cell contains chemical energy which is transferred to electrical energy and is carried by the current and remember that the current is simply a flow of electrons around the circuit when the electrons pass through a component such as a lump the electrical energy is transferred to other forms of energy such as light and thermal energy we use potential difference to work out the energy transfers involved the cell has a potential difference of nine volts so the current is carrying nine jewels of electrical energy per Coulomb of charge the potential difference across the lamp is also nine volts telling us that all of the electrical energy carried by the current is transferred