Relationship Between Current and Voltage

Relationship between Current and Resistance

• Resistors are electrical component used to reduce the current flow in a circuit.
• A fixed resistor has a resistance that cannot be changed.
• A variable resistor, or rheostat, has a resistance that can be changed.
• The larger the resistance, the smaller the current flowing through the circuit.

Relationship between Voltage and Current

• If the resistance is fixed, we can change the current flow by changing the voltage of the electrical supply in the circuit.
• The larger the voltage, the larger the current flow through the circuit.

Ohm's Law

• Current flowing through a circuit is dependent on the voltage and resistance in the circuit.
• Ohm's law states that current flowing through a conductor is directly proportional to its voltage.
• This is true if the temperature and other physical conditions remain constant.