What do current voltage graphs show?
What do current voltage graphs show?
Take a graph where the current flow is shown on the vertical axis and the voltage is shown on the horizontal axis. This shows that as the current changes in a component, so does the voltage.
What is the slope of a current vs voltage graph?
The relationship between voltage and current is Ohm’s Law, and the slope of the line from a graph of the two is the value of the resistance in the circuit.
How do you find the resistance of a voltage and current graph?
Calculating resistance
- To find the resistance of a component, you need to measure:
- The resistance is the ratio of potential difference to current.
- For example, 3 A flows through a 240 V lamp.
- resistance = 240 ÷ 3 = 80 Ω
- If you plot a graph of current against potential difference for a wire, you get a straight line.
What makes current flow in an electrical circuit?
An electric current flows when electrons move through a conductor, such as a metal wire. The moving electrons can collide with the ions in the metal. The resistance of a long wire is greater than the resistance of a short wire because electrons collide with more ions as they pass through.
What is the Y intercept of a voltage vs current graph?
The y-axis has the value of voltage (V) and the x-axis has the values of current (I). The y-intercept is zero.
Why is the current voltage graph for a filament lamp a curved line?
A Filament Lamp Here the graph curves because as the filament heats it’s resistance goes up (the resistance of the filament is changing).
Why is voltage proportional to current?
The current in a circuit is directly proportional to the electric potential difference impressed across its ends and inversely proportional to the total resistance offered by the external circuit. The greater the battery voltage (i.e., electric potential difference), the greater the current.
