# Potential difference and current relationship graphic powerpoint

### Current Electricity

To investigate the relationship between current and potential difference for a resistor, Graph plotting potential difference against current for a fixed resistor. Students learn how to find the maximum power point (MPP) of a Ohm's law and the power equation) and how they apply to solar energy applications. . Looking at the power equation, we discover that we need the highest current and voltage possible The blue line in the Figure 2 graph is an I-V curve. How do different components affect the flow of current? Plot a current-voltage graph of the results. V. A. How can The connection between current, voltage.

- Series and parallel circuits
- Current and potential difference
- Potential difference and electromotive force.

Picture this model that might help you to understand electrical circuits and electricity flow… Imagine a really wide, multi-lane road that narrows each time it approaches a bridge. At each bridge there is a toll collector who must be paid before you can cross the bridge and proceed. The bridges represent the resistors in an electric circuit while the multi-lane road represents a conducting lead.

## Electric current and potential difference

When the flow of cars, equivalent to the electric current in a circuit, reaches the bridge they must slow down, pay their toll and then cross the bridge. The payment of the toll is like the charges losing their energy as they pass through a resistor.

In a series circuit of three resistors, we can imagine the scene looks a bit like the diagram shown below: In a series circuit the resistors lay one after the other. The toll being paid is equivalent to the energy lost in passing through the resistor.

To reach the other end and complete the circuit, each car must divide its money energy so that each toll can be paid. The flow of cars current is restricted by the number of resistors bridges.

In this example the bridges are in parallel. You will notice that there are more cars flowing along the road a larger currentbut each car has only the one bridge to cross, so they pay a hefty toll, giving up ALL their energy as they cross the bridge. This means the voltage for each resistor bridge is the same when resistors are attached in parallel and the resistance of parallel resistors is less than for the same resistors connected in series.

If only one MPPT inverter is used for the entire plant, it is impossible to achieve the maximum efficiency from each panel in this situation. It is up to engineers to decide the right balance of cost and efficiency when designing solar power plants.

Conduct a post-introduction assessment as described in the Assessment section; have students read the attached Fundamentals Article, and write down five important facts they learned. To find the highest possible power output for a panel under a certain set of conditions amount of sunlight, temperature, etc. Collected voltage and current data from PV panel trials, and calculated power data.

## Electric circuits

The values in Table 1 were obtained by using a potentiometer to vary the resistance in the PV circuit, which directly affects the voltage and current in the circuit. A potentiometer is a small device that changes the resistance with the turn of a knob.

The changing resistance affects the overall power output of the panel. The MPP can also be found as the point at which the product of the current and voltage equal the greatest value. This data can be visualized more clearly in a graph. Graphing the current and voltage creates a curve that is referred to as an I-V curve.

### Series and parallel circuits - Ausgrid

The blue line in the Figure 2 graph is an I-V curve. The current is plotted in amps A on the left y-axis.

**Cardiac Action Potential, Animation.**

The voltage is plotted in volts V on the x-axis. On this same graph, the power for each current-voltage combination is plotted in pink. The power is plotted in watts W on the right y-axis. This power curve clearly shows the maximum power point.

A red line identifies the voltage and current associated with the maximum power point. Example I-V or maximum power point curve. The ratio of the useful energy delivered by a dynamic system to the energy supplied to it. The point on a power I-V curve that has the highest value of the product of its corresponding voltage and current, or the highest power output. A device that continually finds the MPP of a solar panel or array. A cell of silicone that produces a current when exposed to light.

A device that allows the user to vary the electrical resistances in a circuit.