Electricity Flashcards
What is an LDR?
a resistor that is dependent on the intensity of light.
What is a thermistor?
A temperature dependent resistor
Define Power
Rate of work done
State the equation that links power energy and time
P=w/t
State the equation for electrical energy
E = VIT
State an equation for power
P=IV
State an equation for voltage
V=IR
What is the difference between a parallel and series circuit?
Series circuits are one continuous loop, parallel has multiple loops
What is a Thermistor
A resistor who’s value depends on temperature
What is a resistor
Resists a current in a circuit
What is an LED
A diode that emits light when in the correct bias
What is an LDR
Light dependent resistor. A resistor who’s value varies depending on light intensity.
What is a diode?
Allows current to flow easily in one direction but restricts current flowing the other direction
What is an Ammeter
Measuring either direct or altering electrical current in amps.
Voltage Equation
V = E/Q
E = Energy
Q = Charge
Charge equation
Q = I x t
I = Current
t = time
What is Ohm’s Law (Voltage equation)?
V = IR
I = Current
R = Resistance
What is the Power equation
P = IV
I = Current
V = Voltage
What is the Energy equation
E = IVt
I = Current
V = Voltage
t = time
What is the definition of Voltage (potential difference) ?
Energy transferred per unit charge
What is the definition of current?
The rate of flow of charge
What is the definition of resistance?
The opposition of the flow of charge.
What is the definition of power?
The rate of energy transfer
What is a switch’s role in a circuit
Turns the circuit on and off
What is a bulbs role in a circuit
It emits light
What is a voltmeter’s role in a circuit
It measures voltage
What is a ammeter’s role in a circuit
It measures current
What is a resistor’s role in a circuit
Produces electrical resistance
What is an LDR’s role in a circuit
A Light dependent resistor produces electrical resistance depending on light intensity
What is a thermistor’s role in a circuit
A temperature dependent resistor produces electrical resistance depending on temperature level
What is a variable resistor’s role in a circuit
A resistor, so produces electrical resistance, but one we can change the value of.
What is the role of a diode in a circuit?
Only allows current to flow one way
What is the role of an LED in a circuit?
An LED is a Light emitting diode so only allows current to flow one way and emits light
What is the role of a fuse in a circuit?
Breaks the circuit in a short circuit
What is the role of a cell + battery in a circuit?
They are a source of potential-difference (voltage)
What is current measured in?
Amperes
What is voltage measured in?
Volts
What is resistance measured in?
Ohms
