What is the effective resistance between posts A and B? R = 48.8 ohm R = 30 ohm

Question

What is the effective resistance between posts A and B? R = 48.8 ohm R = 30 ohm R=28.2 ohm R = 20 ohm R = 17.5 ohm The light bulbs and batteries in the two circuits are identical. Compare B_1 the total brightness produced by circuit 1, with B_2 the total brightness produced by circuit 2. B_1 B_2 Consider the circuit shown to the right. Which of the following is a valid Kirchhoff voltage equation for the dotted outside loop? E_1 + I_1 R_1 - E_2 + I_3 R_3 = 0 -E_1 + I_1 R_1 + E_2 - I_3 R_3 = 0 E_1 - I_1 R_1 - E_2 - I_3 R_3 = 0 Which of the following is a valid Kirchhoff current equation for mode B? I_1 + I_2 + I_3 = 0 I_1 - I_2 - I_3 = 0 I_1 - I_2 + I_3 = 0

Explanation / Answer

here,

the resistance for parallel combination of 20 ohm and 20 ohm , R1 = 20 * 20/( 20 + 20) ohm

R1 = 10 ohm

the equivalnet resistance , R = ( 30 + 10) * 30 /( 30 + 10 + 30) ohm

R = 17.5 ohm

the equivalent resistance is (e) 17.5 ohm

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