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WorksheetsQUIZ 3.4 EMF & INTERNAL RESISTANCE,r
Total questions: 15
Worksheet time: 4hrs 45mins
It is an energy supply by a battery/ electrical source to a coulumb unit of charge.
This refers to
Potential difference
Internal resistance
Electromotive force
Current
It is a work done or energy supply to move a unit of charge from 1 point to another point in a closed circuit
This refers to
Internal resistance
Potential difference
Electromotive force
Resistance
What is the reading of voltmeter when the switch is closed?
What is the value of the internal resistance?
Which is a true statement?
No sources of emf have internal resistance
Some sources of emf have internal resistance
Most sources of emf have internal resistance
All sources of emf have internal resistance
What is emf?
the electro motive "force" or the force on electrons
the electromotive "force" or the Voltage of a cell measured when there is no current flowing
the electromotive "field" or the Voltage of a cell measured when there is no current
the electromotive "force" or Voltage of a cell measured when connected to a circuit
Correct
ϵ=V+Ir
ϵ=I(R+r)
ϵ=V
One dry cell with e.m.f value of 2V and internal resistance 1Ω is connected to one resistor 4Ω
0.4A
0.5A
2.0A
2.5A
A battery of e.m.f. 12 V and internal resistance 1.5 Ω was connected to a 4.5 Ω resistor, what is the value for current?
4A
6A
2A
8A
A battery of e.m.f. 12.0 V, with an internal resistance of 3.0 Ω, is connected in series with a 15.0 Ω resistor and a battery of e.m.f. 9.0 V, which has an internal resistance of 2.0 Ω. Calculate the p.d. of the 15Ω resistor.
15.75V
5.25V
15.25V
15.50V
What is internal resistance?
the resistance inside the cell that increases with more current drawn from the cell
the resistance inside the cell that decreases with more current drawn from the cell
the resistance inside the cell that remains constant as the current drawn from the cell changes
the resistance inside each component which increases as more resistances are added in series
The gradient of this line represents the
internal resistance
emf of the cell
power of the cell
resistance of the circuit
The "y" intercept of this graph represents the
internal resistance
total resistance
total voltage
emf of the cell
Look at the graph and use it to work out ε and r
ε = 0.5V, r = 1.2Ω
ε = 1.2V, r = 0.8Ω
ε = 1.2V, r = 0.5Ω
ε = 0.8V, r = 0.5Ω
