Extension
4 describe the movement of the electrons in an a. c. circuit by relating it to the
changing potential difference of the supply.
(3 marks)
5
look back to the diagram in question 2. when the original trace was made the
oscilloscope's volts/div dial was set at 0.5 volts/div and the time base was set
at 5 ms/div. calculate the frequency of the supply.
(3 marks)

an ion is a charged atom or molecule. it is charged because the number of electrons do not equal the number of protons in the atom or molecule. an atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.

answer: the correct answer is   air pressure at the top of mount everest is higher than at the bottom of the grand canyon.

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explanation: