Today it is 200 years ago, that H. C. Ørsted discovered electromagnetism. Without knowing it, he formed the basis for the widespread use of electricity in our daily life, that we live today.
Electromagnetism is used for motors, radio, radar, mobile phones, computers and speakers.
Hans Christian Ørsted 1777 – 1851, was a Danish physicist and chemist who discovered that electric currents create magnetic fields, which was the first connection found between electricity and magnetism: https://en.wikipedia.org/wiki/Hans_Christian_%C3%98rsted
We examined sound waves and an Electronic Circuits, by putting together a small keyboard.
The synthesizer is build around the NE555 timer chip and a resistor-ladder.
Parts
Diagram
Below is a screenshot from »Engineer’s Mini-Notebook« by Forrest Mims from 1984. This version uses a lot of different capacitors which makes it more expensive. The previous DIY version shown above is very cheap compared to this one.
One of our children is very fond of learning and making electronics with her dad. She is a very quick learner, 11 years old now. A friend of ours gave her this job – describe and connect all the wires and I’ll pay you a wage.
It is reverse engineering of a printed circuit board. The pieces has been reused from old electronics he already had at home or from dumpster diving.
We like to challenge ourselves with new projects. Challenge ourselves with stuff we are scared of, or put off, because it could be hard and uncomfortable.
Sleeping in shelters and going camping is new to us and has taken us a bit of time to get into. When we go into new areas we havn’t explored before, we do research. Loads of research.
We also find learning about geography from books and media hard to remember. It doesn’t really stick. What we have found, is that if we go somewhere it is easier for us to remember geographical locations. That can be an expensive way to learn 🙂 But we set ourselves affordable projects.
For many years we have wanted to visit Jutland, especially the Northern part. There is so much unique nature to see there, which we wanted to show the children.
As we did not have much money, we decided to sleep in shelters and go camping in out tents.
The first night we slept in a shelter in Moesgaard Forest close to Århus. We found out that there often is very far to walk to the shelters with all your stuff. So we got free exercise. We had a lovely evening with fire and singing. When the night came, we were presented with extreme weather experiences with lightning, thunder and massive rain. We are still happy to have survived.
Moesgaard forest shelter.The Moesgaard forest was right next to the sea.
During the day we visited Moesgaard Museum, which is an historical museum where you can see Gravballe man. Read about the museum here: https://www.moesgaardmuseum.dk/en/
Moesgaard Museum.Life and death exhibition at Moesgaard Museum.Sun ceremony at Moesgaard Museum.
We also had the opportunity to meet up with 2 other Home Schooling Families from Jutland at the museum. The museum has a lot of interactive elements in the exhibitions, which is a great way to involve you in the different time periods.
The next day we decided to stay at a Campsite, we had visited last year, and knew they had a great pool. During the day we visited “Den Gamle By i Århus” which is a large area where you can visit different time periods in Danish history: https://www.dengamleby.dk/en/den-gamle-by/
Soap shop in Den Gamle By. Ford T.1970 at Den Gamle By.Amusements at Den Gamle By.Camping by Århus.
We then drove to Skagen. On the way we stopped at the shelter and free camping site that we had read about. But the weather was very wild and rainy so we started to talk about spending a bit to rent a cabin. We walked out to the shelter and it was a beautiful place and free (not so strange in that weather 🙂 but another thunder and lightning weather was on the way and the majority vote in the family was towards renting a cabin at a campsite. The main complaint was that we would have to walk 4 km in rain out to the shelter. So we drove around a few campsites until we found a free cabin. What luxury! A roof over our heards. Come thunder and lightning, we were ready.
Crazy weather.On the way to the shelter we will come back to another time.The Cabin at Råbjerg Mile Campsite.
After having found accommodation we drove to Skagen Museum and saw the Krøyer exhibition and the main exhibition about the Danish Skagen painters.
Skagen Museum.
We then decided to go full spending, and went out to eat at a traditional fish restaurant at Skagen Harbour. The kids said:”Now we have tried the top and the bottom of living”.
Skagen fish restaurant.
To save money, we decided the next 2 days to move into our tents again, but to stay at the same campsite. Because they had both an outdoor and an indoor pool 🙂 The children were hooked on the place.
Jacuzzi at the campsite.
From there we had a quick drive to Råbjerg Mile. A large area with sand, which moves 15 meters towards the North-East every year.
Råbjerg Mile.Råbjerg Mile.
Then we drove to see the sanded down church. We climbed the tower. We then tried to emagine the 20 meter church below the ground.
The Sanded Down Church.
Then on to see the Rugbjerg Knude Fyr, which is just about to slide into the ocean and disappear. But they will try to make an attempt to move it further into the land.
Rugbjerg Knude Fyr.
We then drove to Lønstrup to visit another friend and Home Schooler. Lovely evening with dinner, talk and play. The drive back to our campsite presented us with a magical natural phenomenon. There was sea fog all over. It looked so beautiful.
Sea Mist.Sea Mist.
When we got back to the tent our air mattresses had punctured and we had to sleep straight on the ground. Our backs really got straightened out 🙂
The next day, we tried to repair our air mattresses, but no luck, so had to go buy new ones. We then drove to Grenen and spoiled ourselves with a tractor drive out there. Some of us had a swim in the two oceans – Skagerak and Kattegat. The weather was lovely that day.
Grenen.
Our oldest daughter had brought her physics book on the holiday, so we could work a bit with it in the evenings. Today she read about center of gravity, torque and force times arm. We explored some of it by doing gymnastics.
Center of Gravity.
We then had a very rainy night and had to pack some very wet tents and other wet stuff together in the car. Then we set off towards our final goal – Farmfun at Ålbæk. We had booked a Junglehut for 1 night. We also met up with 2 more Home School families there. Farmfun is a great place with a mix of farm animals but also many exotic animals. You can got close to many of the animals and the animals are really calm and thriving. There is also obstacle courses and labyrints. You can also play in the barns and try a cable car. Frankly, despite the rain, it was a wonderful place.
White eared silk monkeys. They were so curious and cute!Playing in the barn in rainy weather.You could buy vegetables to feed the animals with.Our cabin was the highest one – the Giraf Cabin.Barbecue in the evening in one of the barns.Early morning trip around the farm feeding all the animals.Feeding the Camel named Anker.
Farmfun was a wonderful free place to be. To sleep in the Jungle Cabins was a magical adventure. Imagine sleeping in a Tree House right above an Emu, having all the animals around you, with all their special sounds and smells. When we opened the door to our cabin in the morning, 3 cats stormed into our cabin and had a party. When we got back home we really missed the animals and the spirit of Farmfun.
On this trip we confronted a lot of limits we had (mostly the mother, the kids and the husband are dead cool on that behalf 🙂 We survived heavy thunder, lightning and rain. Digged a toilet in the forest and survived using it 🙂 set up the tents and took them down most days, moved from one place to another every day, slept in a different bed every night, slepts without a mattress. Swam in the ocean without having brought a towel or swimsuit. We feel we have gained courage and confidence.
My husband had for a long time wanted to make the periodic table more easily understandable, and got the idea that by working with the most common everyday used metals, we could actually touch the atoms.
We have had a few different versions of the periodic table on our wall for many years, but got a new more clear version given, so we decided to take the old ones down and put that clearer and larger one up in our living room.
That started a collection of little metal fragments, that the kids put up on the table by the correct metal.
Then my husbands holiday came, and we had the time to do a metal project. He made a specification sheet that they should fill out for every metal we worked with.
Monday we talked about iron. A metal easy to recognize and plentiful in our surroundings. He had made a iron coil earlier around an iron pole, so we got the chance to also do the Ørsted experiment again.
Tuesday we talked about gold. He told the story about the King who wanted to make sure the crown he had ordered was completely made of gold, and how Archimedes helped him solve that problem. We also looked at the stock exchange quotes for metals in the newspaper (Børsen).
Wednesday we talked about copper. Copper is widely used for wires used for electronics, so we had the chance to measure electric circuits on our Oscilloscope and our newly made Joule Thieves. After the lesson at home, we went to The Technical Museum in Elsinore and saw the original Ørsted Compas from 1820 (see photo). We also saw an Exhibition dealing with our extreme use of mobile phones today, which also take great use of copper and a large number of other metals.
The Specification sheets.Measuring electric circuits in our joule thieves with our Oscilloscope.Ørsteds Compas 1820 exhibited in the Technical Museum in Elsinore.Thoughts and information about our excessive use of Smart Phones in the Exhibition at The Tehcnical Museum in Elsinore 2019-07-31.
Thursday we talked about aluminium. Many of our pots and pans were made of aluminium. Aluminium is very thermally conductive, so good when cooking food, to get a high heat quickly and to get back to a low heat quickly too.
We found that many of our pots and pans were made of aluminium.
Friday we went on a field trip to the local Metal Scrap Yard. We had made an appointment earlier with an employee there, who were kind enough to show us around on a guided trip.
Visit to Metal Scrap Yard 2019-08-02.Aluminium.A machine that grinds and sieves copper cables and separates copper from the plastic.They had a machine that could detect the metal content in a material. We checked it out on a 20 kr. coin.
Today we got to try out if we could make smoke rings with a Vortex Canon and smoke bombs. It worked! We had seen it at a Maker Space arrangement, and thought it could be so cool to try. The Vortex Canon works with air pressure. It is very simple, you pull back an elastic inside the cylinder.
Today we did an experiement with static electricity. So simple, but so effective! Our daughter rubbed the balloon with a piece of wool and created static electricity. The water was then pulled over by the balloon.
My oldest daughter found these very motivating videos on youtube. How great to have youtube while home schooling. So many great people out there! She can sing a great part of it now. Learning can always be fun. You just have to be a little creative.
Great to dance to and think about. We look up the things we don’t understand and learn about new areas.
