In the path given below, what is the voltage across R1 resistor?

F2 Savita Engineering 31-3-23 D3

This question was previously asked in
RRB ALP Electronics Mechanic 23 Jan 2019 Official Paper (Shift 2)
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  1. 20
  2. 10
  3. 15
  4. 30

Answer (Detailed Solution Below)

Option 3 : 15
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Detailed Solution

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Voltage divider rule

When n numbers of resistors are connected in series, then the voltage across Rth resistor can be obtained as:

\(V_{th}=V_s\times {R_{th}\over R_1+R_2.......R_n}\)

where, Vs = Supply voltage

Vth = Voltage across Rth resistor

Calculation:

Given, Vs = 45 V

Rth = 5Ω 

 \(V_{th}=45\times {5\over 5+10}\)

Vth = 15 V

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