Task 6 – Modify existing circuit to comply with specified operating parameters.

The total current in the circuit needs to be reduced to approximately 50% of the original value. This will be done by changing the value of resistor R2.

Calculate:

1. the value of the replacement resistor - R NEW

50% of existing current

show your working here 

Answer. = mA

New Total circuit resistance

show your working here 

Answer. = Ω

New replacement for R2 = RT - (R1+R3)

show your working here 

Answer. = Ω

2. the new total power dissipated by the circuit - PT NEW

show your working here 

Answer. = W

Use an ohmmeter to find a suitable replacement resistor from those provided. replace R2 and check your selection by building the circuit and measuring the circuit current.

Measured circuit current matches that in Q1.  = mA