# Physics experiments on induction and alternating current

## Experiments on the interaction of magnetism and electricity for 6 learning groups

With these high-quality materials, students from grade 9 onwards can carry out important experiments on the topic of induction and alternating voltage themselves. Motivated by captivating examples from everyday life, they safely work out with this class set how magnetism and electricity interact. For example, what happens in a coil when electricity flows through it? How do the magnetic fields around a current-carrying conductor and a coil differ?

Special features
- All student experiments are developed according to safety regulations: current limit < 3 A, voltage up to 12 V, output voltage at the transformer up to 4 V AC
- The U-I core is available six times in the class set for parallel work by the learning groups.
- The completeness of the experiment materials can be checked at a glance.

Tip: For the self-induction experiment, you also need some parts that are not included in the 54075 class set (see accessories). Alternatively, you can find all these small parts in the supplementary set 54076.

Art. no. 54075

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further product description

In the accompanying material
- The teacher's manual is didactically prepared and suitable for immediate use.
- The experiments are enriched with a list of materials, instructions for carrying them out, evaluation and tips for you as a teacher. QR codes for internal differentiation, hint boxes, formula support and many 3D illustrations offer individual help to the learners.

- Magnetic fields of current-carrying conductors and coils
- Induction in coils
- Generator
- Transformer
- Lenz's rule
- Delayed switch-on process with parallel connection of L and R, switch-on and switch-off processes with coils
- Impedance

experiments
• 1 - Oersted’s experiment

### experiment "Oersted’s experiment"

A compass is used to study the magnetic field of a copper wire caused by an electric current. In addition to the classical findings from the Ørsted experiment, the disturbing influence of the Earth's magnetic field on this experiment is also addressed.

• 2 - The magnetic field of a solenoid

### experiment "The magnetic field of a solenoid"

A compass is used to study the magnetic field of a coil with 8 turns caused by an electric current (2 A).
The evaluation also addresses the influence of the Earth's magnetic field on the observation.

• 3 - The electromagnet

### experiment "The electromagnet"

The influence of the coil parameters winding number, current and permeability on the strength of the magnetic field is qualitatively investigated. The strength of the magnetic field is assessed according to how strongly an iron sheet strip is attracted to the upper end of an I-core located in the coil.

• 4 - Electromagnetic induction

### experiment "Electromagnetic induction"

In four small sub-experiments, it is investigated how the highest possible voltage can be induced with permanent magnets and a coil.
The amount of the voltage is determined by the deflection of a electroplating or multimeter directly connected to the coil.

• 5 - Generating an alternating current

### experiment "Generating an alternating current"

A rotatable permanent magnet is rotated in front of a coil. The AC voltage generated in the coil is supplied with a galvanometer directly connected to the coil.

• 6 - The transformer

### experiment "The transformer"

In an unloaded transformer, primary and secondary voltage are measured with two multimeters.
In the evaluation, the legal relationship between the measured voltages and the number of turns of the coils is independently discovered.

• 7 - Lenz’s Law

### experiment "Lenz’s Law"

A bar magnet is quickly moved into a free-hanging aluminum ring. Subsequently, the observations are traced back to the law of induction and Lenz's rule.

• 8 - Self-induction

### experiment "Self-induction"

The influence of a coil on the switch-on and switch-off process is observed in simple circuits of switches, lamps and LEDs.

• 9 - The impedance of a solenoid

### experiment "The impedance of a solenoid"

With a function generator, the inductance with and without iron core is indirectly determined via a measuring resistor.

scope of supply
• 18 × Magnet rod AlNiCo, north pole marked red
• 1 × Spool of thread
• 6 × Bulb 4V / 1 A
• 6 × Crocodile clips
• 6 × Support bail with plug
• 6 × Flat bar magnet
• 2 × Set of (4) compasses
• 6 × Needle support with plug
• 6 × Test board with bulb socket and 2 crocodile clips
• 6 × U-core with I-core and clamping screw
• 6 × Coil for student’s transformer with 1200 turns
• 6 × Coil for student’s transformer with 600 turns
• 1 × Welding strips, set of 10
• 6 × Magnetic needle 35 mm
• 1 × Versuchsanleitung Klassensatz Induktion und Wechselspannung
Art-Nr.
Artikel
23110
Lever switch arm with plug
23111
Lever switch contact with plug
52188
Lamp Holder MES
53171
Bulb 6 V / 0,3 A
54961
Digital voltmeter for students 20V DC
54962
Digital ammeter for students 10A DC
62718
LED, white
62791
Bridge Plug, 19 mm
62880
Resistor on plug-in element, 20 Ohm, 1 W

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