By What Percent Does The Current Through A Change When The Switch Is Closed?

ChrisWM

For an ideal bombardment (r = 0 Ω), closing the switch in (Figure 1)does not affect the brightness of seedling A. In practice, bulb A dims merely a little when the switch closes. To see why, assume that the 1.50 V bombardment has an internal resistance r = 0.30 Ω and that the resistance of a glowing bulb is R = 8.00 Ω.

Role A: What is the electric current through bulb A when the switch is open? This answer was .181 A

Role B: What is the current through bulb A after the switch has closed? This reply was .174 A

Part C: By what percent does the electric current through A alter when the switch is closed? This is where I am stuck, I've tried -iii.86,-3.87,3.86,iii.87,4.02, and -4.02 and they are all wrong. Ive washed . (174-.181)/.181, and (.181-.174)/.174 and got the answers in the previous sentence, and I tried both positive and negative.

Delta2

Attempt 3.867% (together with the % symbol)

jbriggs444

Part C: By what percent does the electric current through A change when the switch is closed? This is where I am stuck, I've tried -3.86,-3.87,3.86,three.87,4.02, and -4.02 and they are all wrong. Ive washed . (174-.181)/.181, and (.181-.174)/.174 and got the answers in the previous sentence, and I tried both positive and negative.

How many significant figures are in that location in 0.174 - 0.181 ?