The signal light
 Fred |
 Lilly |
"Of course, you're right. The flatiron uses electricity to heat up!"
"So there is a heating element and a small lamp in the ciruit. And either both of them are on or off."
"When the small lamp goes out and the heating up stops, too, the electric circuit is disruptet, isn't it?"
"As with a light switch, you mean?"
a) Similar to a light switch. But with the flatiron, the opening and closing of the circuit happens automatically after we have turned it on.
b) No, light switches are not part of the circuit, but directly connected to the lamp.