Electric Charge and Fields — the invisible forces at play

How electric charges create the fields that shape everything from atoms to therapy beams.

Every charged particle carries an invisible influence around it — an electric field. This field tells other charges how to move, attracting or repelling them depending on their sign.

Positive and negative charges are like two sides of a magnet, always seeking balance. When they move, they create electric currents, and those currents generate magnetic fields — the foundation of electromagnetism.

When there’s a difference in electric potential between two points, we call it a voltage (or potential difference). It’s like a pressure that pushes charges through a wire or across a small gap. The higher the voltage, the stronger the push, and the faster the charges move.

But not all materials let charges flow freely. Resistance is what slows them down, converting some of that electrical energy into heat or other forms of energy. In medical equipment, managing resistance ensures that electrical currents remain stable and precise, protecting both the system and the patient.

In radiation therapy, electric fields and voltages work together to accelerate charged particles to high speeds. These particles are then guided and focused within the treatment head to form precise treatment beams. These invisible forces shape the beam that ultimately delivers precise doses to patients.

Stay positive,
Sara