Book work Flashcards
What is the equation for energy?
E=P x T
What is the equation for power?
P=I x V
P=I2 x R
What is the equation that links Potential difference, Current and resistance?
V=IR
What is the unit for energy?
What is the unit for power?
Joules(J)
Watts(W)
What is the equation that links Charge flow, Current and Time?
Charge flow = current x time
What is the equation that links Energy, Potential difference, Current and Time?
Energy = P.D x current x time
What are the units for Current?
What are the units for Resistance?
Amps(A)
Ohms
What piece of equipment measures:
Voltage?
Current?
Voltmeter
Ammeter
What is LED short for?
Light emitting diode
What is LDR short for?
Light dependant resistor
A series circuit has a battery with a P.D of 12V, connected to a light bulb with a resistance of 4 Ohms. What is the size of the electric current in this circuit?
3 Ohms
A parallel circuit has a 20V power supply connected to two 8 Ohm resistors in parallel. Calculate the size of the current flowing through the battery.
5 A
What is the combined resistance of two 25 Ohm resistors connected in parallel?
Less than 25 Ohms
If the current through a component increases, what happens to the P.D across it?
The P.D increases
To obtain the I-V curve of a component a variable resistor is connected in series with the component. Changing the resistance changes the current in the circuit. The ammeter should be connected.
In series with the component
What happens to the resistance of an LDR as the light intensity increases?
It decreases
Kinetic energy equation
E = v^2 x 0.5 x k
A series circuit has a 9V battery connected to a 2 Ohm light bulb. Calculate the current flowing through the bulb and it’s power.
4.5A, 18W
Potential energy
The energy associated with the bonding state of the particles
Internal energy
The total kinetic and potential energy of the particles in a system
Temperature
The average kinetic energy of all the particles in a substance
Specific heat capacity
The amount of energy required to raise the temperature of 1kg of liquid at its melting point
Specific latent heat of fusion
The amount of energy needed to change 1kg of solid to 1kg of liquid at its melting point
