Alternating current

AC graphs can be dull as ditchwater if you're not careful so this is what I do:- Get the students to be DC electrons walking round room. Then get them to change direction every time I say 'Change.' Then tell them this isnt that accurate and give them 3 speeds, -3 to +3. Then go through these and to make it most accurate, linger on the -3 and +3 for the longest. Then get a kid to run up and down a number line to show how AC values change with time.