What is the current through bulb A when the switch is open? What is the current

Question

What is the current through bulb A when the switch is open?

What is the current through bulb A after the switch has closed?

By what percent does the current through A change when the switch is closed?

For an ideal battery r = 6 ohm What is the current through bulb A when the switch is open? What is the current through bulb A after the switch has closed? By what percent does the current through A change when the switch is closed? Would the current through A change when the switch is closed if and that the resistance of a glowing bulb is , closing the switch in the figure does not affect the brightness of bulb A. In practice, bulb A dims just a little when the switch closes. To see why, assume that the 1.5 V battery has an internal resistance

Explanation / Answer

V = IR Here is the current with the switch open (two resistors in series): 1.5 = I(6.0 + 0.6) I = 0.227A And here is the current with the switch closed (one series and two parallel resistors): 1/Rt = 1/R1 + 1/R2 1/Rt = (1/6 + 1/6) Rt = 3 Rb = 0.6 1.5 = I (Rb + Rt) 1.5 = I (0.60 + 3.0) I = 0.417A

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