Table of Contents
- 1 Is it possible to have a negative current?
- 2 What does a negative measured current mean?
- 3 Can scalar quantities have negative values?
- 4 How do you measure negative voltage?
- 5 How is negative voltage possible?
- 6 How can work be negative if it is a scalar?
- 7 How do you know if the current is positive or negative?
- 8 How do you find the voltage of a circuit?
- 9 What is the relationship between current and voltage in an electric circuit?
Is it possible to have a negative current?
Negative current is current flowing in the opposite direction to positive current, just like the axes on a graph have negative and positiva in opposite directions.
What does a negative measured current mean?
Originally Answered: What does it mean if current is negative? If a current measurement is negative, it means the current is flowing in the direction opposite to that which is expected.
Can scalar quantities have negative values?
Scalar quantity can never be Negative. Because scalar got only magnitude not direction.
Can you have a negative voltage?
Yes, a voltage can be negative with respect to ground. Many operational amplifiers require both a positive and a negative voltage measured with respect to ground. That way, the op amp output can swing positive or negative with respect to ground.
How does negative current work?
So, if you get a negative current, that means that it flows in the direction opposite you assumed. The power dissipated on the ohmic load is proprtional to the square of the current. So the power always flows from the source (a battery, for example) to a load.
How do you measure negative voltage?
Try a current mirror using a pair of PNP transistors hanging on the Vcc rail. Feed the negative voltage signal to the input side of the mirror through an appropriate resistor. The same current should then flow through the output transistor of the mirror.
How is negative voltage possible?
In the case when a voltage source has negative voltage, it just means the negative terminal of the battery is connected to the positive side of the circuit and the positive terminal of the battery is connected to the negative side of the circuit . Both voltage sources are connected to an LED.
How can work be negative if it is a scalar?
As you said; work is a scalar quantity. If theta is the angle between force and displacement; now what happens when the displacement is in a direction opposite to force; in such case the cosine is negative as the angle between them is not in the first quadrant, therefore this makes work negative.
Can a vector have negative magnitude?
Answer: Magnitude cannot be negative. It is the length of the vector which does not have a direction (positive or negative). The zero vector (vector where all values are 0) has a magnitude of 0, but all other vectors have a positive magnitude.
What happens when voltage changes on a current vs time graph?
When the voltage changes from a positive slope (shown in blue in Figure 5) to a negative slope (orange), the direction of the current reverses; this is represented in the current vs. time plot as a change from the positive-current section of the graph to the negative-current section of the graph.
How do you know if the current is positive or negative?
When the voltage has a positive rate of change, the current is positive (indicated by the blue arrowhead); when the voltage has a negative rate of change, the current is negative (indicated by the orange arrowhead). Figure 6. I-V curve for an ideal capacitor based on the voltage sweep shown in Figure 5.
How do you find the voltage of a circuit?
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. You should be able to recognise these graphs for resistors at constant temperature, for filament lamps and for diodes.
What is the relationship between current and voltage in an electric circuit?
An electric circuit is capable of transferring power. Current is the rate of flow of charge, and voltage measures the energy transferred per unit of charge. We can insert these definitions into the equation for power: Electrical power is the product of voltage times current. in units of watts.