4.2 Potential difference ( pd ) and power Potential Difference: * is defined as the work done (or...
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4.2 Potential difference ( pd ) and power Potential Difference: * is defined as the work done (or energy transfer) per unit char V (Volt) = B A + + If 1J of work is done in moving of positive charge from A to B t Pd is 1V 1V = 1 J / C
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Transcript of 4.2 Potential difference ( pd ) and power Potential Difference: * is defined as the work done (or...
4.2 Potential difference ( pd ) and power
Potential Difference:
* is defined as the work done (or energy transfer) per unit charge
V (Volt) = W (work done, J) Q (charge, C)
B
A +
+
If 1J of work is done in moving 1 C of positive charge from A to B then the Pd is 1V
1V = 1 J / C
4.2 Potential difference ( pd ) and power
Potential Difference:
* is defined as the work done (or energy transfer) per unit charge
V (Volt) = W (work done, J) Q (charge, C)
B
A +
+
If 1J of work is done in moving 1 C of positive charge from A to B then the Pd is 1V
1V = 1 J / C
4.2 Potential difference ( pd ) and power
Potential Difference:
* is defined as the work done (or energy transfer) per unit charge
V (Volt) = W (work done, J) Q (charge, C)
B
A +
+
If 1J of work is done in moving 1 C of positive charge from A to B then the Pd is 1V
1V = 1 J / C
4.2 Potential difference ( pd ) and power
Potential Difference:
* is defined as the work done (or energy transfer) per unit charge
V (Volt) = W (work done, J) Q (charge, C)
B
A +
+
If 1J of work is done in moving 1 C of positive charge from A to B then the Pd is 1V
1V = 1 J / C
4.2 Potential difference ( pd ) and power
Potential Difference:
* is defined as the work done (or energy transfer) per unit charge
V (Volt) = W (work done, J) Q (charge, C)
B
A +
+
If 1J of work is done in moving 1 C of positive charge from A to B then the Pd is 1V
1V = 1 J / C
Voltage or pd:* is electrical pressure* causes current to flow* is measured in Volts (V) with a voltmeter in parallel
1.5 V 1.5 V
1.5 V
1.5 V 1.5 V 1.5 V
1.5 VV
Voltage or pd:* is electrical pressure* causes current to flow* is measured in Volts (V) with a voltmeter in parallel
1.5 V 1.5 V
1.5 V
1.5 V 1.5 V 1.5 V
1.5 VV
Voltage or pd:* is electrical pressure* causes current to flow* is measured in Volts (V) with a voltmeter in parallel
1.5 V 1.5 V
1.5 V
1.5 V 1.5 V 1.5 V
1.5 VV
Energy from a battery
e……..
w….
e…….
E……..
Voltages in series circuits
The cell gives electrical potential energy to each electron – even when not connected
* Work is done by an electron when passing through a component.* Some of the electron’s electrical potential energy is transferred to heat and light.* The work done per coulomb of charge is called the potential difference across the component
-- J J J
J
Energy from a battery
e……..
w….
e…….
E……..
Voltages in series circuits
The cell gives electrical potential energy to each electron – even when not connected
* Work is done by an electron when passing through a component.* Some of the electron’s electrical potential energy is transferred to heat and light.* The work done per coulomb of charge is called the potential difference across the component
-- J J J
J
Energy from a battery
e……..
w….
e…….
E……..
Voltages in series circuits
The cell gives electrical potential energy to each electron – even when not connected
* Work is done by an electron when passing through a component.* Some of the electron’s electrical potential energy is transferred to heat and light.* The work done per coulomb of charge is called the potential difference across the component
-- J J J
J
Energy from a battery
e……..
w….
e…….
E……..
V V
VVoltages in series circuits
Energy from a battery
e……..
w….
e…….
E……..
V
V V
3 V4
3 V4
1.5 VVoltages in series circuits
The higher the v……... of the battery the more energythe electrons can t………... to the bulbs.
The bulb f………. heats up. Some of this heat energy is transformed to l…... energy.
voltagetransferfilament
light
V
V V
Voltages in series circuits
V
V V
3.0 V
1.5 V 1.5 V
In a series circuit the voltage is shared across components
Voltages in series circuits
A
In a series circuit the voltage is shared across components
V V
3.0 V
1.5 V 1.5 V
V 0.2 A
Voltages in series circuits
A
In a series circuit the voltage is shared across components
V V
3.0 V V
V V
0.1 A
Voltages in series circuits
A
In a series circuit the voltage is shared across components
V V
3.0 V V
V V
3 V4
3 V4
3 V4
3 V4
0.1 A
Voltages in series circuits
A
In a series circuit the voltage is shared across components
V V
3.0 V V
V V
3 V4
3 V4
3 V4
3 V4
0.1 A
Voltages in series circuits
Each bulb adds more resistance to the series circuit.
The current flowing drops.The voltage across each bulb drops
Problem:
If 30 J of work is done when 5C of charge passes through a component,calculate the potential difference across the component.
V = 30 J = 6 V 5 C
V (Volt) = W (work done, J) Q (charge, C)
4.2 Potential difference ( pd ) and power
Problem:
If 30 J of work is done when 5C of charge passes through a component,calculate the potential difference across the component.
V = 30 J = 6 V 5 C
V (Volt) = W (work done, J) Q (charge, C)
4.2 Potential difference ( pd ) and power
EMF Electromotive force of a source of electricity:
* is defined as the electrical energy produced per unit charge passing through the source
4.2 Potential difference ( pd ) and power
W ( J) = (Volt) X Q ( C) Electrical energy
produced when charge Q moves through the source
For a component with
For a component with
For a component with
For a component with
For a component with
For a component with
For a component with
