Table of Contents
- 1 What happens when a wire is connected across a bulb?
- 2 What happened to the brightness of the bulb as the length of the wire was increased?
- 3 What happens to the voltage across the resistor R1 when the switch is closed the voltage will?
- 4 When light bulbs are added to the circuit what does it have to do with the electrons?
- 5 What is the effect on bulb by changing the wire from a thick wire to a thin wire in an electric circuit?
- 6 What causes a light bulb to light up?
- 7 What happens when voltage is doubled to 25 W?
What happens when a wire is connected across a bulb?
When the wire is connected, all the charge continues to flow through the bulb. half the charge flows through the wire; the other half continues through the bulb. all the charge flows through the wire.
What happens in an electrical circuit when a light bulb is connected to a battery?
If the light bulbs are connected in parallel, the current flowing through the light bulbs combine to form the current flowing in the battery, while the voltage drop is 6.0 V across each bulb and they all glow. In a series circuit, every device must function for the circuit to be complete.
What happened to the brightness of the bulb as the length of the wire was increased?
Answer:Increasing the number of bulbs decreases the brightness of the bulbs. In a series circuit, adding bulbs increases the resistance in the circuit.
Why is there no current in a light bulb unless it is connected across a source of applied voltage?
The reason is the potential difference across the part of the circuit containing the switch is zero. As a result, no current flows through it when the switch is closed so nothing changes. Since the voltage across the bulb remains constant and R increases, the power decreases.
What happens to the voltage across the resistor R1 when the switch is closed the voltage will?
We just saw that closing the switch causes an increase in the voltage across R1 (which is VAB). The voltage of the battery is constant, so if VAB increases, then VBC must decrease!
What happens to the bulbs in a series circuit if one bulb blows?
Complete answer: When a number of bulbs are connected in series and one amongst them blows off, the rest of the bulbs blow off as well. This is because the blowing off of one of the bulbs cuts the power supply to the rest of the bulbs.
When light bulbs are added to the circuit what does it have to do with the electrons?
As bulbs are added the resistance in the circuit decreases since each circuit is another pathway for electrons to move from one end of the circuit to the other.
Which bulb will glow brighter in parallel?
In a parallel circuit, 100W bulb glows brighter due to high power dissipation instead of an 80W bulb. The bulb which dissipates more power will glow brighter. In series, both bulbs have the same current flowing through them.
What is the effect on bulb by changing the wire from a thick wire to a thin wire in an electric circuit?
16 Cards in this Set
| In a simple series circuit, why does the bulb light when you close the switch? | Because closing the switch completes the circuit. |
|---|---|
| What is the effect of changing the wire in a circuit from a straight thick wire to a straight thin wire? | The bulbs become dimmer. |
How is a light bulb connected to a circuit?
Circuit A Both the metal casing and tip of the bulb are connected to the circuit, forming a closed circuit. Thus, electricity is able to flow through the wires in the circuit to the filament, allowing the bulb to light up.
What causes a light bulb to light up?
When the wires in the circuit are connected to the metal casing and metal tip of the bulb, there is a closed (or complete) circuit with the bulb. Electricity will be able to flow through the filament, causing the bulb to light up.
How is potential energy dissipated in a light bulb?
The loss of potential energy results in an increase in the temperature of the material, which is dissipated as radiation. In a resistor, it is dissipated as heat, and in a light bulb, it is dissipated as heat and light. The power dissipated by the material as heat and light is equal to the time rate of change of the work:
What happens when voltage is doubled to 25 W?
Thus, when the voltage is doubled to a 25-W bulb, its power nearly quadruples to about 100 W, burning it out. If the bulb’s resistance remained constant, its power would be exactly 100 W, but at the higher temperature, its resistance is higher, too.