Electricity Flashcards
Define Voltage
Energy transferred per unit charge
Define Current
Rate of flow of charge
What are the charge carriers in a circuit
Electrons
Define the power rating of an appliance
Energy used per second
What is the symbol for charge
Q
What is the symbol for voltage
V
What is the symbol for current
I
What is the symbol of resistance
R
Adding resistors in parallel will do what tot the overall resistance?
Decreases the overall resistance.
What is ohm’s law?
V=IR
What will happen to the current in a circuit with constant resistance when the voltage increases?
The current increases.
What happens to the resistance of an LDR if the light level increases?
Resistance decreases.
What happens to resistance of a thermistor if the temperature goes up
Resistance decreases.
What is the symbol of power?
P
State the units of Voltage
Volts (v)
State the units of Power
Watts (w)
State the units of current
Amps (A)
State units of resistance
Ohms
State units of Charge
Coulombs (C)
Which type of fuse would be used in a 500 W appliance?
3A
Which type of fuse would be used in a 800 W appliance?
13A
What is used to measure voltage
Voltmeter
What is used to measure Current
Ammeter
What is used to measure resistance
ohmmeter
How is a voltmeter connected?
In parallel
How is an ammeter Connected?
In series.
In a parallel circuit current will…
In a parallel circuit current will split between branches.
If a large and small resistor are connected in parallel, which will receive more current?
Small resistor. Current will take path of least resistance.
In a parallel circuit the voltage will…
In a parallel circuit the voltage will be equal to the supply across each branch.
In a series circuit voltage will…
be shared between components.
In a series circuit current is…
the same at all points.
