solution

Solution - Exercise 1:

A resistive load is connected to a voltage source. If the voltage at the load is increased by 20 V, the current increases by 8%. What is the original voltage if there is a linear relationship between current and voltage?

Solution Exercise 4

Calculate total resistance
R₂₃ =R₂ + R₃ = 4 Ω
R₄₅ = 1,5 Ω
R₄₅₆ = R₄₅ + R₆ = 4 Ω
R₂₃₄₅₆ = 2 Ω
R_total = R₁ + R₂₃₄₅₆ = 10 Ω

So that total voltage V_I:
V_I = R_total · I = 10 Ω x 10 A = 100 V

Solution Exercise DC Circuit

I₄₅₆ e.g. via current divider rule:
I₄₅₆ = I · R2₃₄₅₆ = 10 A · 2 Ω  = 5 A
.            R₄₅₆             4 Ω
=> V_R6 = I₄₅₆ · R₆ = 5A · 2,5 Ω = 12,5 V