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WorksheetsD.C. Circuits
Total questions: 5
Worksheet time: 10mins
A fixed resistor of resistance 12 Ω is connected to a battery. There is a current of 0.20 A in the resistor. The current is now doubled.
What is the new power dissipated in the resistor?
0.48 W
0.96 W
1.9 W
4.8 W
There is a current in a resistor for an unknown time.
Which two quantities can be used to calculate the energy dissipated by the resistor?
the current in the resistor and the potential difference across the resistor
the resistance of the resistor and the current in the resistor
the total charge passing through the resistor and the potential difference across the resistor
the total charge passing through the resistor and the resistance of the resistor
Two cells with electromotive forces E1 and E2 and internal resistances r1 and r2 are connected to a resistor R as shown.
The terminal potential difference across cell 1 is zero.
Which expression gives the resistance of resistor R?
A battery has an electromotive force (e.m.f.) E and internal resistance r. The battery delivers a current I to a variable resistor and the potential difference (p.d.) across its terminals is V.
The variable resistor is adjusted so that I increases. Why does V decrease?
The e.m.f. E decreases.
The internal resistance r increases.
The p.d. across r increases.
The resistance of the variable resistor increases.
Three identical resistors are connected between terminals P and Q in different networks X, Y and
Z as shown.
What is the order of increasing combined resistance between P and Q (lowest first)?
X → Y → Z
X → Z → Y
Y → X → Z
Y → Z → X
