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**Part 1:** Checkbox tasks - only one is right at a time!

**Part 2:** Work orders

**Work order 1:**

Three resistors are connected to a three-phase power supply.

1.1 In which type of circuit are these resistors connected to each other?

1.2 What is the current I_{L} in the supply line ?

1.3 What is the size of a phase resistor if the total power of the circuit is 10 kW?

**Work order 2:**

Three resistors are connected together to Delta.

2.1 What is the current flowing through a resistor?

2.2 How large is the conductor current I_{L}?

2.3 Calculate the total power of the circuit!

2.4 The fuse S1 blows. How large is the conductor current I_{L2}? Draw the equivalent circuit díagram!

**Work order 3:**

Three equal-sized 80 Ω heating resistors of a three-phase heater are connected as shown. The string current is 5 A.

3.1 Which connection is shown here?

3.2 To which line voltage must these resistors be connected? Justify by calculation!

3.3 What is the supply current I_{1}?

3.4 What is the rated power of the heater?

3.5 What is the current in the supply line if a fuse blows?

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