Find the battery's emf. Find the internal resistances

Four 20.0 W resistors are connected in parallel and the combination is connected to a 20.0 V ideal battery. The current in any one of the resistors is:

In the figure the current in resistance 6 is i6 = 1.33 A and the resistances are R₁ = R₂ = R3 = 1.720, R₂ = 16.5 Q, R5 = 8.750, and R6 = 4.79 Q. What is the emf of the ideal battery? Number i E 40 www R₁ Units www R3 R₂ www R₁ 2 www R₂ R6

In (Figure 1), R1R1R_1 = 3.00 ΩΩ, R2R2R_2 = 7.00 ΩΩ, and R3R3R_3 = 4.00 ΩΩ. The battery has negligible internal resistance. The current I2I2 through R2R2 is 3.00 A . What is the emf of the battery? Express your answer with the appropriate units.

When a car's starter is in use, it draws a large current. The car's lights draw much less current. As a certain car is starting, the current through the battery is 64.8 A and the potential difference across the battery terminals is 8.82 V. When only the car's lights are used, the current through the battery is 2.18 A and the terminal potential difference is 10.7 V.   Find the battery's emf. ______ Find the internal resistance. ______