1. 23.2 Applications of Circuits
Safety Devices for an overload or short circuit
Overload when too many appliances are on at once
Short circuit-when very low resistance is formed causing the current to be very large producing large amounts of heat

2. Fuse-a short piece of metal that will melt if the current gets too high
When the metal melts the circuit is open and the current won’t flow
Circuit breaker-an automatic switch that opens the circuit when the current becomes too high
Ground-fault interrupter-When an extra path is formed, such as a hair dryer in water, the ground-fault interrupter will detect even a small change in current and opens the circuit

3. Combined Series-Parallel Circuits

4. Ammeters A device that measures current
What type of circuit with the resistor?
Does an ammeter have high or low resistance?

5. Voltmeter A device used to measure the voltage of the circuit
How is the voltmeter connected?
Does a voltmeter have low or high resistance?