Voltage Divider Formula Important Questions

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Important Questions Voltage Divider

Ques. Define voltage divider. (1 Mark)

Ans. A voltage divider is also known as a potential divider as a unit of voltage is the “Volt”.

A voltage divider is a simple series resistor circuit. The output voltage of a voltage divider is a fixed fraction of its input voltage. The divide-down ratio is determined by two resistors. A voltage dividers are very useful in providing different voltage levels from a common supply voltage and the common supply is a single supply either positive or negative.

Ques. State the formula of the voltage divider. (2 Marks)

Ans. V_out = (R_b / R_a + Rb)V_in

Where;

• V_out is the output voltage
• R_a and R_b are the resistors
• V_in is the input voltage

Ques. Why does a voltage divider require two resistors? (1 Mark)

Ans. The one resistor is used to drop voltage but to divide voltage requires something to create a division ratio. And to be a voltage divider the output voltage needs to be a constant proportion of the input voltage.

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Ques. Why is voltage divided into a series? (1.5 Marks)

Ans. The total sum of the voltages across components in series is equal to the total supply of the voltage. The voltages across each of the components in series are in the same proportion similar to their resistances, which means that, when two identical components are connected in series, the supply voltage divides equally across them.

Ques. What is the function of the voltage divider? (1 Mark)

Ans. A voltage divider’s function is to adjust the level of a signal, for bias of active devices in amplifiers, and to measure voltages.

Ques. What is a purpose of a voltage divider? (1.5 Marks)

Ans. A voltage divider is used to scale down a very high voltage so that it is easily measured by any volt meter. The high voltage is applied across the divider, and the divider output then outputs a lower voltage which is within the meter's input range hence measured by the meter

Ques. How much power does a voltage divider uses? (1 Mark)

Ans. When resistance is too small, the voltage divider itself consumes a large amount of current (i=5 VR1+R2 ) and power (P=(5 V)2R1+R2 ).

Ques. Where is the rule of voltage divider applied? (2 Marks)

Ans. The voltage division rule is known as the basic rule of circuit analysis. It is applicable to all series circuits and combination circuits. The Series circuit always acts as a voltage divider and in a series circuit, the same current flows through each resistance.

Ques. Is the voltage divider sufficient enough? (1 Mark)

Ans. Yes, voltage dividers are very powered insufficient

Ques. How voltage divider was derived? (1.5 Marks)

Ans. The voltage divider was derived from Ohm's Law. The voltage divider equation can be solved by using Ohm's Law. As we know, according to Ohm's law the current flowing in a circuit is directly proportional to the voltage to potential differences across the circuit.

Ques. What is the rule of voltage division? (1.5 Marks)

Ans. The voltage within any resistor in a series connection of the resistors will be equal to the ratio of the value of the resistor which is then divided by the equivalent resistance of the circuit. Hence, known as the rule of voltage division.

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