# Physics Paper 2 PART 2

What is the amount of energy transferred measured in?
Joules (J)
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What is work done?
The amount of energy transferred.
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What is power?
Power is the rate of doing work (how fast energy is transferred).
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What is power measured in?
Power is measured in watts(W).
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What is 1 watt?
1 watt is 1 joule of energy being transferred every second.
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What is the formula for working out the work done?
work done (J)=force (N) distance moved in x the direction of the force (m)
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What is the formula for working out the power?
power(W)=work done(J)/time taken(S)
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What are the 3 things that energy of a system can be changed by?
The energy of a system can be changed by:work done through forces, electrical equipment and heating a material.
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What can pairs of forces do?
They can interact at a distance or by direct contact.
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What are the three non-contact forces?
gravity,magnetism,electrostatic charges.
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What does gravity do?
Gravity acts between all masses. It is always attractive.
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What does magnetism do?
Magnetism acts between magnetic poles. Unlike poles attract and like poles repel.
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What does electrostatic charges do?
Electrostatic charges exert forces on each other at a distance. Unlike charges attract and like charges repel.
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What do normal contact forces do?
Acts upwards in opposition to the weight of the object.
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What does the force of friction do?
Acts in opposition to the pushing force that is trying to change its motion.
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What is the purpose of a battery (cell)?
provides a potential difference.
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What is the purpose of a switch?
allows the current flow to be switched on or off?
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What is the purpose of a voltmeter?
measures potential difference across a component.
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What is the purpose of an ammeter?
measures the current flowing through a component.
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What is the purpose of a fixed resistor?
provides a fixed resistance to the flow of current.
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What is the purpose of a variable resistor?
provides a variable (changeable) resistor.
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What is the purpose of a filament lamp?
converts electrical energy to light energy as a useful form.
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What is the purpose of a motor?
converts electrical energy to kinetic energy as a useful form.
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What is the purpose of a diode?
allows current to flow in one direction.
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What is the purpose of a thermistor?
resistance decreases when the light intensity increases.
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What is the purpose of a LDR?
resistance decreases when the light intensity increases.
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What is the purpose of a LED?
a diode that gives out light when current flows through it.
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How can components be arranged in circuits?
They can be arranged in series or parallel.
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What does a series circuit contain?
A series circuit contains just one loop, around which an electric current can flow.
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What does a parallel circuit contain?
A parallel circuit contains more than one loop and the current will split up or recombine at the junctions.
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What is an electric current?
An electric current is the rate of flow of charge. In a metal, electric current is the flow of electrons.
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What is the equation for the relation of energy, charge and potential difference?
energy transferred=charge moved x potential difference.
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What is the resistance of a component?
A way of measuring how hard it is for electricity to flow through it. The units are ohms.
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How can the resistance of a circuit be changed?
It can be changed by putting different resistors into the circuit, or by using a variable resistor.
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What does the arrangement of resistors in series or parallel determine?
determines whether the resistance in a circuit increases or decreases.
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What does an I-V graph show?
Shows how the current flowing through a component varies as the potential difference across it varies.
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What happens to the temperature on an I-V graph using a fixed resistor?
The temperature remains the same.
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What happens to the filament lamp on an I-V graph?
As the potential difference increases, the filament gets hotter, and atomic vibration increases.
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What does LDRs stand for?
light-dependent resistors.
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What is the resistance of an LDRs?
The resistance of an LDRs is large in the dark. The resistance gets less if light shines on it. The brighter the light, the lower the resistance.
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What happens to the resistance of light-dependent resistors and thermistors.
The resistance changes according to light conditions or temp.
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What does the resistance of a thermistor depend on?
The resistance of a thermistor depends on its temperature. The higher the temperature, the lower the resistance.
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When a current flows in a circuit, what effect does it have?
It has a heating effect.
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## Other cards in this set

### Card 2

#### Front

What is work done?

#### Back

The amount of energy transferred.

What is power?

### Card 4

#### Front

What is power measured in?

What is 1 watt?