Know how to make an electromagnet and how to vary its strength Know that a complete circuit is needed for electrical devices to work Know that a wire carrying a current in a magnetic field will try to move Know how switches, relays, variable resistors, sensors and logic gates can be used to solve simple problems e.g..
(a complete circuit; is needed; for electrical devices to work) (electrical devices; to work; )
a complete circuit electrical devices
is needed to work
for electrical devices to work