Electric Circuits
Ohm's Law: Basic
The relationship between current and resistance is demonstrated for a fixed voltage.
Click the image to watch the video
- Power supply
- Variable resistor
- Light bulb
- Ammeter
- Connecting wires
A simple electric circuit is set up consisting of a voltage source, a light bulb, and a variable resistor ( in series). The current is measured and shown to vary inversely with resistance while the voltage is held constant.
Ohm's Law and Power
The relationship between current and voltage is demonstrated for a fixed resistance. Electric power is also demonstrated.
Click the image to watch the video
- Power supply
- Light bulb
- Ammeter
- Connecting wires
A simple electric circuit is set up consisting of a voltage source and a light bulb. It is shown that the current through the light bulb varies directly with voltage. In another experiment, it is shown that the power dissipated in the light bulb varies directly with both current and voltage.
Resistors in Series
A circuit with two resistors in series is demonstrated.
Click the image to watch the video
- Power supply
- Light bulbs
- Ammeter
- Connecting wires
Simple circuits are set up consisting of a voltage source and either a single light bulb or two identical light bulbs in series with one another. It is shown by measuring the current that the resistance of two light bulbs in series is greater than that of a single light bulb. It is also shown that for a given applied voltage, the power dissipated in each of the light bulbs connected in series is less than that of the single light bulb.
Resistors in Parallel
A circuit with two resistors in parallel is demonstrated.
Click the image to watch the video
- Power supply
- Light bulbs
- Ammeter
- Connecting wires
Simple circuits are set up consisting of a voltage source and either a single light bulb or two identical light bulbs in parallel with one another. It is shown by measuring the current that the resistance of two light bulbs in parallel is less than that of a single light bulb. It is also shown that for a given applied voltage, the power dissipated in each of the light bulbs connected in parallel is the same as that of the single light bulb.