Resistance in a circuit is a physical constant and can only be modified by changing components, exchanging resistors for those rated at more or fewer ohms, or by adjusting variable resistors. Discover the relationship among current, voltage, and resistance with our Ohm's Law Interactive Java Tutorial. Interactive Java Tutorial Ohm's Law Discover the relationships among current, voltage, and resistance. Resistors Most of the resistance in circuits is found in components that do specific work, such as bulbs or heating elements, and in devises called resistors. Resistors are devises that provide precise amounts of opposition or resistance to current flow.
Resistors are very common in electric circuits.
They are used to provide specific resistivity to limit current and to control voltage in a circuit. Types of Resistors Resistors come in a variety of values and types. The most common type is the fixed resistor. Fixed resistors have single values of resistance, which remain constant. There are also variable resistors that can be adjusted to vary or change the amount of resistance in a circuit.