به انگلیسی

How switches work

علوم · انرژی · سن ۸ تا ۹ سال

نام ______________________ تاریخ ____________

What happens when a switch is open?
- Current stops flowing
- Current flows faster
- Nothing changes
A closed switch lets current flow through the circuit.
دور یکی دایره کشیدن: درست نادرست
Which switch position lets a bulb light up?
- Open
- Closed
- It doesn't matter
You flip the wall switch and the lamp turns on. What position is the switch in now?
- Closed
- Open
- Unplugged
Maya's buzzer will not sound. She checks and finds the switch is open. What should she do to make the buzzer sound?
- Press the buzzer harder
- Add more wires
- Close the switch
Every switch in your home works by opening and closing a circuit.
دور یکی دایره کشیدن: درست نادرست
A doorbell circuit has a battery, a buzzer, and a button that acts as the switch. Someone presses the button, closing the switch. What happens?
- The battery stops working
- The buzzer stays silent because the circuit is broken
- The buzzer sounds because the circuit is now complete
Ben says: "When I open the switch, more current flows and the bulb gets brighter." What is wrong with what Ben said?
- Opening the switch makes the bulb brighter, not dimmer
- Opening a switch stops the current completely, so the bulb goes dark
- Opening the switch has no real effect on the bulb

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Current stops flowing · Opening the switch leaves a gap, so current cannot flow and everything connected turns off.
درست · Closing the switch fills the gap in the wire, so current can flow all the way around.
Closed · A closed switch completes the loop, letting current reach the bulb.
Closed · If the lamp is on, the circuit must be complete, which means the switch is closed.
Close the switch · Closing the switch fills the gap in the circuit, so current can reach the buzzer and it sounds.
درست · Light switches, buzzer buttons, and doorbells all work the same way: closing them completes a circuit.
The buzzer sounds because the circuit is now complete · Pressing the doorbell button closes the switch, completing the circuit so the buzzer sounds.
Opening a switch stops the current completely, so the bulb goes dark · Opening a switch breaks the circuit completely. It does not make the bulb brighter. It turns the bulb off.