Start of device

Drop quarter onto ramp

Quarter rolls down

Mechanical

Mechanical

Quarter drops into tray

Tray depresses lever

Mechanical

Mechanical

Lever closes micro switch

Micro switch completes circuit

Electrical

1.Electrical

Circuit powers Nicrome wire

Wire heats up

Heat

1.Heat

NiCrome wire melts string

String Releases lever arm

Mechanical

1.Mechanical

Lever arm releases micro switch

Micro switch closes circuit

Electrical

1.Electrical

Circuit powers NiCrome wire

NiCrome wire oxidizes candle

Chemical

1.Chemical

Oxidizing candle produces light

Light activates sensor

Electromagnetic

Electromagnetic

Sensor trips relay

Relay completes circuit

Electrical

2.Electrical

Circuit powers LED

LED produces light

Electromagnetic

Electromagnetic

Light activates sensor

Sensor trips a relay

Electrical

2.Electrical

Circuit powers

NiCrome wire

Wire heats up Heat

2.Heat

NiCrome wire melts string

String Releases lever arm

Mechanical

2.Mechanical

Lever arm releases micro switch

Micro switch closes circuit

Electrical

Electrical

Circuit powers motor

Motor spins cam

Mechanical

Mechanical

Cam releases catapult

Launches ball

Mechanical

Mechanical

Catapult releases micro switch

Completes circuit

Electrical

Electrical

Power turns on motor

Motor lowers platform

Mechanical

2.Mechanical

Platform places Cu, Zn strips into acid

Contacts cause electrolysis

Chemical

Chemical

Power from battery trips detected

Circuit trips relay

Electrical

2.Electrical

Circuit powers LED

LED produces light

Electromagnetic

3.Electromagnetic

Light activates sensor

Sensor trips a relay

Electrical

3.Electrical

Circuit powers Nicrome wire

Wire heats up

Heat

3.Heat

NiCrome wire melts string

String Releases lever arm

Mechanical

Mechanical

Lever arm releases micro switch

Micro switch closes circuit

Electrical

Electrical

Power turns on motor

Motor lowers platform

Mechanical

3.Mechanical

Platform places Cu, Zn strips into acid

Contacts cause electrolysis

Chemical

Chemical

Power from battery trips detected

Circuit trips relay

Electrical

4.Electrical

Circuit powers LED

LED produces light

Electromagnetic

4.Electromagnetic

Light activates sensor

Sensor trips a relay

Electrical

4.Electrical

Circuit powers NiCrome wire

Wire heats up

Heat

Heat

NiCrome wire melts string

String Releases lever arm

Mechanical

Mechanical

Lever arm releases micro switch

Micro switch closes circuit

Electrical

Electrical

Circuit powers motor

Motor spins cam

Mechanical

Mechanical

Cam releases catapult

Launches ball

Mechanical

Mechanical

Catapult releases micro switch

Completes circuit

Electrical

Electrical

Power turns on motor

Motor lowers platform

Mechanical

4.Mechanical

Platform places Cu, Zn strips into acid

Contacts cause electrolysis

Chemical

Chemical

Power from battery trips detected

Circuit trips relay

Electrical

5.Electrical

Circuit powers LED

LED produces light

Electromagnetic

5.Electromagnetic

Light activates sensor

Sensor trips a relay

Electrical

5.Electrical

Circuit powers NiCrome wire

Wire heats up

Heat