Here is some of the artwork I have drawn for Wikipedia articles. All are public domain, so anyone can use them for any purpose, including commercial purposes, without attribution.

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  Animation of a dipole antenna receiving power from a radio wave
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  Animated diagram of anchor escapement in a grandfather clock
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  Animation showing how a linear particle accelerator works
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  Animation of operation of a Yagi-Uda antenna
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  Animation of a dipole antenna transmitting radio waves, showing the electric field lines
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  Animated diagram of phased array antenna
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  Animation showing operation of a resonant circuit (tuned circuit)
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  Animation showing how a Beverage antenna works
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  Animation showing how a reflex loudspeaker works
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  Animation showing derivation of sine and cosine waves from circular motion
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  Animation of voltage and current in a negative resistance
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  Animation of radiation from an isotropic radiator
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  Animation of standing waves on a dipole antenna

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  Diagram of Poynting vectors in the space surrounding a DC electric circuit
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  Diagram explaining proximity effect
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  Diagram illustrating why left and right are reversed in a mirror
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  Diagram showing how interference in an optical flat works
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  Magnetic field of an electromagnet
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  Diagram of torsion balance used in the Cavendish experiment
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  Diagram illustrating reflection of X, Y, and Z axis vectors in a mirror
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  How a superheterodyne radio receiver works
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  Diagram showing how an eddy current brake works
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  Diagram of magnetic field of loop of wire
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  Drawing of a corner reflector antenna
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  Diagram of a capacitive wireless power system
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  Diagram illustrating displacement current in a capacitor
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  Ground loop currents in audio system
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  Ground dipole antenna for naval ELF submarine communication system
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  Surface charges induced in metal objects by the electric field of a nearby charge by electrostatic induction
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  Jewel bearing for balance wheel in a mechanical watch
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  Diagram and graph showing how electronic band structure arises in solid state physics
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  Diagram showing how to calculate a surface integral of a vector field
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  Illustration for a derivation of the divergence theorem

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  Types of parabolic antenna
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  Types of horn antenna