Electricity - Energy and voltage in circuits Flashcards
Why are series and parallel circuits more appropriate for particular applications
Parallel circuits are more appropriate for domestic lighting as well as LED’s as if one light breaks the others will still work. whereas on a series circuit, all the light will break as they are all connected on the same (line?)
How do you know the current in a series circuit
the voltage divided by the equivalent resistance.
How does current vary with voltage in wires, diodes and filament lamps
Smaller three pictures below big one
https://www.tutormyself.com/2-09-describe-how-current-varies-with-voltage-in-wires-resistors-metal-filament-lamps-and-diodes-and-how-to-investigate-this-experimentally/
What is the qualitative effect of changing resistance on the current in the circuit
The higher the resistance of a circuit, the lower the current
What is the qualitative variation of resistance of light-dependent resistors (LDRs) with
light intensity
and thermistors with temperature
Resistane decreases as light intensity increases
resistance decreases as the temperature increases
What can LEDs be used to indicate the presence of
a current in a circuit
How can LEDs be used to indicate the presence of current in a circuit
these components will only light up or glow when a current is flowing through them
What is the relationship between voltage, resistance and current
V = I x R
What is current
The rate of flow of charge
What is the relationship between charge, current and time
Charge = current x time
Q = I x t
The voltage across two components a in different branches in a parallel circuit is…
The same
What is voltage
The energy transfered per unit charge passed
What is a volt
A joule per coulomb
What is the relationship between charge, voltage and energy transferred
𝑒𝑛𝑒𝑟𝑔𝑦 𝑡𝑟𝑎𝑛𝑠𝑓𝑒𝑟𝑟𝑒𝑑 = 𝑐ℎ𝑎𝑟𝑔𝑒 × 𝑣𝑜𝑙𝑡𝑎𝑔𝑒
𝐸 = 𝑄 × 𝑉
