Battery Power

Project Number: 11

Description: Make sure the battery is charged up (see projects 1 & 3). Build the circuit shown with the motor and fan on the pivot stand, and connect the jumper wires as shown. Set the slide switch (S5) to position B to on the circuit. The battery runs the clock display (T2), horn (W1), red LED (D1), and windmill (M4). Push the press switch (S2) and the hand crank (HC) will also spin. Part B: Set the slide switch to position C to disconnect the battery, and blow on the fan or place it in a strong wind. See if your "windmill" runs things as well as the battery, and for how long. Part C: Leave the slide switch at position C and push the press switch while turning the hand crank to see how well it runs things. Try cranking it in both directions.

Snappy: The battery can store lots of energy, so it can run lots of things for a while. It is available whenever you need it, at the flip of a switch.