Hogwarts: I have graduated before the system came

Douglass led the students into a large prepared lecture theater.

It was the first time for students who were wizards to see such a bright classroom. Some students looked curiously at the LED lights above their heads. Without paying attention, they missed the step when they were going down the steps. The person was so frightened that he quickly grabbed hold of the lights beside them. went and screamed:

"The steps here are the same as those at Hogwarts. They will disappear suddenly..."

At this time, a harsh voice suddenly sounded in the classroom.

Douglas frowned, patted the microphone twice and said:

"Hey, hey, hey, hey... As long as you look down at the road, you will find that it is an ordinary step.

Quickly find a seat and sit down. The students who know more about it will point out where to sit to the students who don’t know about it. Percy, Penelope, you two sit forward. "

Percy and Penelope looked at each other and smiled bitterly.

Maybe other students haven't noticed yet. Since the two of them entered the classroom, they discovered that the closer they were to the classroom podium, the more powerful the magic power in their bodies would be suppressed.

As a wizard, he instinctively wanted to retreat and find his own safe zone, but was discovered by the sharp-eyed Douglas.

The initial plan was to take all the little wizards to visit various campuses of the school, the library, activity and entertainment venues, external laboratories, and canteens.

But when he led the little wizards past a coffee shop, he suddenly saw the door of the coffee shop begin to flash.

Only then did he remember something that he had always ignored. The magic power in the bodies of underage wizards was not stable, which caused magic to be exuded around them all the time.

It would be fine if there were just a few little wizards, and they would not have much impact on the surroundings. When a group of little wizards come together, it is equivalent to an active magical element coming together, and they will always cause something, such as interfering with surrounding electrical equipment.

This discovery forced him to change his plan temporarily, and directly applied for a lecture theater with the school authorities, and briefly arranged it.

Douglas's decision came as a relief to school administrators and Ministry of Magic employees responsible for communications.

As the students stayed in the classroom longer, a few senior students finally discovered something unusual.

They didn't panic too much, but first took a look at the classroom door behind them. Found Sirius Black, holding an ice cream, leisurely leaning against the door frame.

Seeing some students looking over, Sirius raised the corners of his mouth and motioned them to look at the podium with his eyes.

Douglas on the podium picked up the microphone again:

"Students, be quiet. Find your seat and sit down. Don't talk."

"Very well, you must always remember that you are now representing the magical world, and you represent Hogwarts School of Witchcraft and Wizardry, the number one in the magical world.

Although there is no audience, do you know that thing can record everything you say and do? "

Douglas pointed to the corner of the classroom ceiling, where a camera was facing them.

Others didn't understand what it was, but the Muggle-born student had already reacted and whispered: "That's surveillance. It can capture everything we are doing."

Douglas said as he turned on the projector at hand. Students clearly see that they are being projected onto a white cloth at the front of the classroom.

Due to the limitations of the times, even though the University of London still uses the most advanced monitoring equipment in the world, it can still only use digital storage to store it for one minute. If you want to store more monitoring content, you still need cassette recording.

However, Douglas showed the young wizards what he had read a minute ago, and most of them were already stunned.

Douglas looked around and asked:

"Since you entered this classroom, what have you discovered?"

"The classrooms are brighter than those at Hogwarts."

"The chairs are fixed, the tables are fixed."

"The professor didn't use the amplifying spell just now. I know it's called a speaker in the Muggle world."

"We can't use magic now."

"We can't use magic outside of school."

Before the two could continue their discussion, Douglas suddenly shouted:

"Miss Elaine of Ravenclaw, you can stand up and say something."

When this sixth-grade girl heard Douglas call her name alone, she quickly stood up and said:

"Professor, I find that the magic power in our bodies seems to be suppressed, that kind of obscure feeling that cannot be mobilized. But the way I look at Mr. Black, this should be arranged by the professor, right?"

Douglas nodded and continued to ask:

"Yes, I arranged this, so you don't have to worry. But I want to ask, why did I do this?"

Elaine hesitated and said:

"Is that why magic interferes with Muggle electrical appliances? But we don't actively use magic."

Douglas nodded, but made no comment. He looked around and continued to ask:

"Who has anything to add? Hmm, Miss Granger, you answer it."

Hermione stood up immediately and said:

"Professor, what Senior Sister Elaine said is right, this phenomenon is just like household appliances that cannot be used in Hogwarts.

The reason is that although we do not actively use magic, there is a magnetic field around us...I mean the magic energy field, which interacts with the electric magnetic field. "

Douglas nodded and said:

"What you two said is very good. The two influence each other. In fact, wizards' scientific research on ordinary people is not as shallow as you see.

There are many wizards who will magically modify ordinary people's electrical appliances to change electrical energy into magical energy. This is not just about replacing the energy supply, but also requires a good understanding of the operating principles of the electrical appliances.

Although this is the case, there is essentially a problem with the direction of these wizards. Has no one thought about using the characteristics of electric energy and magic energy to make corresponding products?

In fact, not only magic energy can affect electrical energy, but if the electrical energy is enough, magic energy can also be affected. Anyone have any ideas? "

George and Fred both raised their hands.

Douglas glanced at him: "Fred, tell me."

George immediately pressed Fred down and said:

"I'm Fred and I think the two of them could be made to detect each other..."

"Tool...I am Fred, the professor asked me to say."

Percy didn't even look up from the fight between the two brothers in the back row and continued to talk quietly to Penello. This opportunity was too rare. If everyone was busy in class at Hogwarts, there would be no such leisurely time.

"Fred finished, George added. Don't forget, I can tell which of you is who."

Fred adjusted his clothes. He couldn't blame the two of them for competing for credit. They showed up with a secret mission. As long as they performed well, they could exchange for one or two magic props making methods.

"Professor, I think we can use the characteristics of electrical energy to make a device that can detect whether there are traces of magic nearby.

For example, an Auror goes to the wild to chase an enemy, but the opponent suddenly uses magic to hide. Since magic cannot be detected, can electric energy be detected? As long as the electric energy shows abnormality, it means that there must be magic nearby. "

"It can even be used to detect whether there are magic traps...make it and sell it to the Ministry of Magic to make a lot of money."