Here are some applications of the things we will study in this section.
There are two kinds of Christmas tree light. One kind, if one of the bulbs blows,
the whole chain is dead, while for another kind, the chain works even if some of
the lights are out. What's the difference, and why are the
two methods both used?
You have a switch at the bottom of the stairs and a switch at the top of the
stairs, and both will turn the stairs light on and off.
How does that work?
Here's a project you might enjoy: in the kit there is a "bimetallic coil."
It responds to an increase in temperature by unwinding a bit; if you lock the
orientation of the straight part at the center, the tab at the outside will move
about 1 angle degree per Celsius temperature degree. Since the coil is a
electrical conductor, you could make it part of a circuit, that would turn on
a motor (to run a fan) if the temperature gets too high, and turns on a
light bulb (it's also a heater!) if the temperature gets too low. Or
perhaps you would prefer to have an alarm sound?
Here's a project you might enjoy: in the kit there is a "bimetallic coil."
It responds to an increase in temperature by unwinding a bit; if you lock the
orientation of the straight part at the center, the tab at the outside will move
about 1 angle degree per Celsius temperature degree. Since the coil is a
electrical conductor, you could make it part of a circuit, that would turn on
a motor (to run a fan) if the temperature gets too high, and turns on a
light bulb (it's also a heater!) if the temperature gets too low. Or
perhaps you would prefer to have an alarm sound?