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WorksheetsBWS Physics - Internal resistance
Total questions: 10
Worksheet time: 3mins
An ideal voltmeter in physics has...
...an easily readable scale
...an infinite resistance
...zero resistance
...a negligible internal resistance
In Physics, an ideal ammeter has...
...a 10A fuse
...infinite resistance
...an autoranging function
...zero resistance
The correct equivalent circuit diagram for a real battery is...
The correct definition of emf is...
The voltage measured across the terminals of a battery with no load connected
The energy transferred per unit charge to electrical from another type
The energy transferred per coulomb to electrical from another type
The intercept of a graph of voltage against load current for a given battery
The best explanation for why headlamps go dim when a car engine is cranked is...
The power from the battery has to be shared between the headlamps and the starter motor and the starter motor always takes a bigger share
The headlamps are wired in parallel with the starter motor, so when the ignition key is operated some of the current is diverted away from the headlamps
Voltage equals current times resistance - the bigger the current, through the internal resistance, the bigger the voltage
The large current required to operate the starter motor results in more "lost volts" in the internal resistance of the battery
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
Alkaline batteries can get very hot if their terminals are shorted out because...
The instructions for use warn against doing this
The large current they can deliver rapidly transfers a lot of energy as heat in their internal resistance
Gases are produced by electrolysis, which could cause them to explode or start a fire
The are designed to have a high internal resistance, which rapidly heats up when a short circuit current is flowing
A circuit suitable for determining the internal resistance and emf of a cell is...
A car battery has an emf of 12V and an internal resistance of 0.005Ω. The terminal voltage when a load current of 100A is drawn is...
11.5V
0.5V
7.0V
11.5A
A car battery has an emf of 12V and an internal resistance of 0.005Ω. The total power dissipated by the battery when a load current of 100A is drawn is...
12 kW
1.2 kW
1.15 kW
50 W
