TODAY’S OUTCOMES:

- Review what is needed for a complete circuit and how to avoid short circuits

- Investigate how siphons and flowing fluids work

- Consider why we are doing a study of siphons and fluids in a study of electricity

ELECTRICITY

> Look inside a flashlight to find out how it works. In the space below, draw the circuit diagram for the flashlight.

The possible combinations are:Switch A open, Switch B open - - - - - Switch A open, Switch B closed - - - -Switch A closed, Switch B open - - - - Switch A closed, Switch B open - - - -

> Two circuit diagrams are shown below, with switches labeled A and B. 1) 2)

For circuit 1), how many possible open/closed combinations are there for the switches? For each combination, state whether or not the light bulb will light.

The bulb will not light (there is no complete circuit).The bulb will light (there is a complete circuit through bulb).The bulb will not light (there is no complete circuit through the bulb).The bulb will not light properly (there is a complete circuit, but there is also a short circuit).

How will the behavior of circuit 2) differ, if at all? This circuit is very similar to 1), and it will behave the same, with switches A and B interchanged.

Will the bulb in 2) be brighter, dimmer, or about equally bright to the bulb in 1) when lit?The bulb will be about equally bright to the bulb in 1). The bulb’s distance from the battery, or bends in the wire don’t really matter - all that matters are the available paths in the circuit!

CIRCUITS ARE DESIGNED TO DRIVEVARIOUS DEVICES

ELECTRICITY TENDS TO FOLLOW THE EASIEST PATH

heat

short circuit -bulb will not light

Every one of these diagrams contains a short circuit (blue dotted line)

Avoid short circuits by checking that every possible electrical

loop between positive and negative points contains a device!

WHAT YOU ARE EXPECTED TO KNOW:

- What is needed for a complete circuit

- How to draw circuit diagrams with various electrical components

- What constitutes a short circuit and how to avoid it

TODAY’S OUTCOMES:

- Review what is needed for a complete circuit and how to avoid short circuits✓

- Investigate how siphons and flowing fluids work

- Consider why we are doing a study of siphons and fluids in a study of electricity

ELECTRICITY