Safe Play
Take the children out to an appropriate place to look for warning signs including ones about electricity*. Start in the school grounds. They should record the signs they see either by sketching or using a digital camera. Store digital images on a computer for reference.
They should also make notes of where each sign is, what it warns about and what makes it noticeable. If the sign is electronically operated they should note this, too.
Back in the classroom, ask about any symbols they noticed. Are the same symbols used in different signs? Discuss how standard symbols are useful. Also ask about any commonly used colours and shapes.