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Why is AC signal sinusoidal and DC a straight line?
AC signal is sinusoidal as changes it’s polarity after every 10ms (frequency=50 Hz), whereas dc have fixed polarity (+ and -) that’s why it has straight line.
When a graph between current through and voltage across a device is a straight line the device is referred to as?
When the graph of current versus voltage is a straight line, the device is referred to as. A. Active. Linear.
Does DC flow in a straight line?
Direct current waveform is a straight line (Fig. 1). The main sources of direct current are power supplies and voltaic cells (i.e. batteries and rechargeable batteries). Most electronic devices are supplied with direct current.
Why is DC current unidirectional?
In DC (Direct current) circuits, the flow of electrical charge (or in other words, electrons) is unidirectional and unlike AC Current, it does not periodically reverses its direction. The typical waveform of alternating current is a pure sine wave as shown in the figure below.
Why do we use sine in AC?
But in basic circuit analysis and AC signal analysis, we tend to use sine waves because they are the easiest to generate (as compared to square/ramp signals) as well as the easiest to analyze mathematically (all our calculus tools work wonderfully for curves like the sine, but tend to be more inconvenient around things …
What kind of a device is a diode?
A diode is a semiconductor device that essentially acts as a one-way switch for current. It allows current to flow easily in one direction, but severely restricts current from flowing in the opposite direction.
What do you call a straight line voltage graph?
These are known as current-voltage graphs or I–V graphs. Components which show a straight line I–V graph are linear circuit elements. They are also sometimes called ‘ohmic circuit elements’. This means that current is directly proportional to potential difference for that component.
Is the plot of current over voltage linear or nonlinear?
Any function that can be plotted on a graph as a straight line is called a linear function. For circuits with stable resistances, the plot of current over voltage is linear (I=E/R). In circuits where resistance varies with changes in either voltage or current, the plot of current over voltage will be nonlinear (not a straight line).
What are the components of a current voltage graph?
Different devices have different resistance characteristics. These can be investigated using graphs that show: These are known as current-voltage graphs or I–V graphs. Components which show a straight line I–V graph are linear circuit elements. They are also sometimes called ‘ohmic circuit elements’.
Which is the characteristic curve of a voltage?
The characteristic curve (curved line), representing the current I through the diode for any given voltage across the diode VD, is an exponential curve. The load line (diagonal line), representing the relationship between current and voltage due to Kirchhoff’s voltage law applied to the resistor and voltage source, is