A 9 v battery is connected across a series combination of 100 W, 35 W, and 55 W resistors. The current measured in the circuit is 100 mA. What can be wrong in this circuit?
W = Watt (unit of power)
Resistance: Ohm =Ω =>
total resistamce
R=100 Ω+35 Ω+55 Ω=190 Ω
According to Ohm's Law
ℰ=IR =100•10⁻³•190 =19 V ≠ 9 V.
thank you for answering my question. i need to find out why it is only outputing 100mA current only
100 W resistor is open.
100 W resistor is shorted.
35 W resistor is shorted.
55 W resistor is shorted.
An open resistor is a resistor with one of the leads not connected.An open resistor can have no current or voltage, and it can have no effect on any circuit. =>
35 Ω and 55 Ω are shorted and 100 Ω is open =>
ℰ=IR =100•10⁻³• 90 = 9 V.
Thank you Elena, you are a big help.
To identify what could be wrong in the circuit, let's analyze the given information and calculate the expected current.
We have a series combination of resistors connected to a 9 V battery. The resistances are given as 100 W, 35 W, and 55 W, and the measured current is 100 mA.
In a series circuit, the total resistance (RT) is the sum of individual resistances. So, in this case, RT = 100 W + 35 W + 55 W = 190 W.
According to Ohm's law, the current (I) flowing through a circuit can be calculated using the formula I = V / R, where V is the voltage and R is the resistance.
Substituting the values, we have I = 9 V / 190 W, which is approximately 0.047 A or 47 mA.
Comparing the calculated current (47 mA) with the measured current (100 mA), we observe a significant difference. This suggests that something is wrong in the circuit.
Possible reasons for the discrepancy in the measured current could include:
1. Incorrect measurement: The current measurement could be inaccurate due to faulty equipment or improper measurement techniques. Double-check the measurement setup and ensure that you're using reliable equipment.
2. Faulty connection: Check the connections between the battery and the resistors. There might be loose or faulty connections that are affecting the current flow. Ensure that all connections are secure.
3. Resistor values: Confirm that the given resistance values for the resistors are accurate. Check for any errors or discrepancies while reading the resistor values.
4. Wrong resistor values used: It's possible that incorrect resistor values were used in the circuit. Verify that the resistors' actual values match the specified values, as using resistors with different resistance values can lead to variations in current.
5. Faulty components: The resistors themselves could be defective or damaged, leading to unexpected readings. Check the resistors for any signs of damage or degradation.
It is important to carefully analyze and troubleshoot the circuit to identify and rectify any issues.