Concept 2: Current

Calculate the current flowing through the circuit of a toy car that has a resistance of 20 Ohms and is powered by a 3 volt battery

.15 amps

calculate the voltage difference in a circuit with a resistance of 25 ohms if the current is 0.5 amps

10 Volts

Current

A flow of electric charge.

Explain how a battery works

Changes chemical energy stored inside the battery into electrical energy.

differentiate between the effects of the open vs. closed circuit

If the circuit is open, the current can't flow but if the current is closed then the current will flow.

Describe the four factors that affect resistances

Material: Insulators have more resistance than conductors Size of the wire: Smaller diameter wore has more resistance Length of wire: Longer wires has more resistance Temperature of wire: higher temperature has more resistance

Explain the relationship between voltage, current, and resistance in a circuit

Voltage is the push that causes charges to move and current is the result of voltage. Resistance tries to prevent the current from flowing. The higher the voltage, the higher the current. The lower the resistance, the higher the current.

voltage difference

related to the force that causes electric charges to flow

Ohm's Law

the amount of current is directly proportional to the voltage difference

resistance

the tendency for a material to oppose the flow of electrons