4) Electricity Flashcards
Explain why as the bulb brightness (voltage) increases the temperature of it also increases.
The increased voltage means increased brightness because it is proportional. Increased brightness is more heat because some of the generated electric energy is converted to heat energy makes the surface of the bulb hot.
What would happen to the brightness of the bulb if the wire resistance were increased?
It would go dim as the current decreases from the wire resistance because they stop some electrons from flowing in the circuit.
This is a series circuit. If a second identical bulb was introduced to the circuit, state what would happen to both the current and voltage in the circuit if the battery is unchanged.
The 2 lightbulbs will share the voltage taking ½ and ½ for each one, its 50/50 because they have the same resistance. The current will remain the same.
If one of the bulbs in a series circuit was to break, state what will happen to the other bulb and why.
The other bulb will turn off because every single componnet in a series circuit is connected thus having constant electrons flowing through, by breaking one of these pieces you will break the circuit and the other bulb will stop working.
Explain whether voltage causes current, or whether current causes voltage in a series circuit?
Voltage causes current because voltage is essentially the pressure that pumps electrons out to form current. Current is the flow of electrons which wouldn’t be possible with voltage.
Fuses have a maximum amp (current) rating. Describe what a fuse is and explain what should happen if the maximum current is exceeded in a fuse.
A fuse is like an automatic detonator for your electric circuit if it reaches over the maximum amp rating. It will break the circuit to minimise damage to your circuit and to prevent a fire or other risks.
Explain what non-ohmic means.
It is something that doesn’t fit in Ohmic’s law. An ohmic resistor will have a non-linear increase in voltage with the line not following the 1/R gradient.
Explain how you could tell if a resistor is non-ohmic.
You can test the current and voltage with the resistor then plot it on a graph, if the graph shows a linear relationship that has a gradient of 1/R, then it is correct but if it is non-linear then its considered non-ohmic.
Rules for current and voltage in a series circuit
Current are the same
Voltage are different depending on how much resistance they add to the total current
Rules for current and voltage in a parallel circuit
Current are different as they split when encountering more than 1 path
Voltage stays the same across each componenet no matter the resistance.
What is the energy transformation that occurs inside a wind turbine?
When the wind rotates the blades of the turbine the kinetic energy is converted into rotational energy. This rotational energy is transfered to a generator to transform into electrical energy.
