Refer to the circuit shown in Figure 8–22. The circuit has an applied voltage of 24 V an...

Refer to the circuit shown in Figure 8–22. The circuit has an applied voltage of 24 V and the resistors have values as follows:

R₁ = 1 k Ω

R₂ = 300 Ω

R₃ = 750 Ω

R₄ = 1 k Ω

An ammeter and a voltmeter indicate the following values:

I_T = 42.5 mA

I₁ = 24 mA

E₁ = 24 V

I₂ = 18.5 mA

E₂ = 5.5 V

I₃ = 0 A

E₃ = 18.5 V

I₄ = 18.5 mA

E₄ = 18.5 V

What is the most likely problem with this circuit?