The reading of the ammeter for a silicon diode in the given circuit is
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According to Ohm's Law, Voltage (V) = Current (I) × Resistance (R)
- 0
- 15 mA
- 11.5 mA
- 13.5 mA
The Correct Option is C
Approach Solution - 1
According to Ohm's Law, Voltage (V) = Current (I) × Resistance (R)
From the Given equation, V = 3V, R = 200 ohm, I =?
Here, across the diode potential barrier ΔV=0.7 volts
The formula will look like, I=(V−ΔV)/R
Therefore, I= (3−0.7) /200
=0.0115 A
=11.5 mA
Discover More Topics from Chapter: Current Electricity
Approach Solution -2
The Correct Answer is (C): 11.5 mA
Real Life Applications
- Silicon diodes are frequently used to rectify electrical systems, converting alternating current (AC) voltage to direct current (DC) voltage. The AC voltage is changed into a pulsing DC voltage by the diode, which permits current to flow only in one direction. This throbbing DC voltage may then be smoothed down with a filter circuit to provide a stable DC voltage.
- Silicon diodes can be used in voltage regulator circuits to keep the output voltage consistent. The diode conducts more current as the input voltage rises, lowering the output voltage to the desired value. In contrast, when the input voltage falls, the diode conducts less current, causing the output voltage to rise to the required value. Signal detection: Silicon diodes may be used to find and correct weak signals in signal detection circuits. Only one direction of the AC signal can flow through the diode; the resulting rectified DC signal can then be amplified and processed by other electronic parts.
- Silicon diodes can be utilised as overvoltage protection devices to shield delicate electronic components from transient voltage spikes. When a voltage spike occurs, the diode, which is linked in reverse bias across the component, conducts and shunts the excess voltage away from the component, shielding it from harm.
- Silicon diodes can be utilised in electrical circuits as temperature sensors to measure temperature. Temperature changes the forward voltage drop across the diode, which measures temperature.
Question can also be asked as
- What is the current through the silicon diode in the given circuit?
- What is the value of the ammeter reading in the given circuit?
- How much current does the silicon diode in the given circuit conduct?
- What is the forward current of the silicon diode in the given circuit?
- What is the diode current in the given circuit?
Approach Solution -3
The Correct Answer is (C): 11.5 mA
This problem can also be solved by using Kirchoff's Law,
Then the equation will look like, 3-V- I (200) = 0
Here, V = 0.7V
Therefore, 3 - 0.7 - 200I = 0
⇒200I = 2.3
⇒ I = 2.3/200 = 0.0115
So, I = 11.5 mA
Kirchhoff’s Current Law
According to Kirchhoff's Current Law, no charge is wasted and the total current flowing into a junction in an electric circuit equals the charge leaving the node.
Kirchhoff’s Voltage Law
According to Kirchhoff's Voltage Law, the voltage in a closed network is equal to the total of all voltage drops in the loop and is zero.
Use of Kirchhoff’s Laws
In order to simplify the circuits and calculate the quantum of current and voltage in circuits, Kirchhoff's laws or Kirchhoff's rules are used to analyze complicated electrical circuits.
- By using these rules, calculating unknown currents and voltages is simple.
- Kirchhoff's Laws only have one drawback: they can only be used if there isn't a fluctuating magnetic field inside the closed loop, which isn't always the case.
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Concepts Used:
Current Electricity
Current electricity is defined as the flow of electrons from one section of the circuit to another.
Types of Current Electricity
There are two types of current electricity as follows:
Direct Current
The current electricity whose direction remains the same is known as direct current. Direct current is defined by the constant flow of electrons from a region of high electron density to a region of low electron density. DC is used in many household appliances and applications that involve a battery.
Alternating Current
The current electricity that is bidirectional and keeps changing the direction of the charge flow is known as alternating current. The bi-directionality is caused by a sinusoidally varying current and voltage that reverses directions, creating a periodic back-and-forth motion for the current. The electrical outlets at our homes and industries are supplied with alternating current.