Free Printable 4E ScPhy: Current of Electricity

1.

Current I is defined as the rate of flow of (a)

2.

The symbol for the physical quantity electric current is...

a)

V

b)

A

c)

I

d)

Q

3.

The SI unit for the physical quantity electric current is...

a)

V

b)

A

c)

I

d)

Q

4.

Which instrument is used to measure electric current (I) and how should it be connected?

a)

voltmeter, series

b)

ammeter, series

c)

voltmeter, parallel

d)

ammeter, parallel

5.

An electric charge is positive if it has _______ electrons than protons.

a)

less

b)

more

6.

An electric charge is negative if it has _______ electrons than protons.

a)

less

b)

more

7.

The symbol for electric charge is the

a)

I

b)

Q

c)

A

d)

t

8.

The SI unit for electric charge is the

a)

I

b)

Q

c)

C

d)

A

9.

What is the amount of charge carried by one electron?

a)

1.60 x 10^-19 C

b)

1.60 x 10¹⁹ C

c)

1.0 C

d)

3.00 x 10⁸ C

10.

By convention, current is defined as flowing from ______________ to ______________ terminal.

a)

positive, negative

b)

positive, positive

c)

negative, positive

d)

negative, negative

11.

What do the arrows in the circuit represent?

a)

conventional current flow

b)

electron flow

c)

voltage

d)

resistance

12.

Current is the rate of flow of charges.

Which is the correct corresponding formula?

a)

$Current=Ch\arg e\ \times Time$

b)

$Current=\frac{Ch\arg e}{Time}$

c)

$Current=\frac{Time}{Ch\arg e}$

13.

What is the amount of charge flowing through a bulb if a current of 2.0 A is provided for 2.5 minutes?

a)

5 C

b)

75 C

c)

300 C

14.

a)

Battery

b)

Dry cell

c)

Resistor

d)

Bulb

15.

a)

Ammeter

b)

Voltmeter

c)

Closed switch

d)

Open switch

16.

Potential difference or voltage is defined as the (a) to drive a unit charge through a component.

17.

Electromotive force (e.mf.) is defined as the work done to drive a unit charge through a (a)

18.

The symbol for the physical quantities voltage/pd/emf is...

a)

V

b)

R

c)

I

d)

Q

19.

The SI unit for the physical quantity voltage/pd/emf is...

a)

V

b)

A

c)

$\Omega$

d)

Q

20.

Which instrument is used to measure pd/emf/voltage and how should it be connected?

a)

voltmeter, series

b)

ammeter, series

c)

voltmeter, parallel

d)

ammeter, parallel

21.

Which physical quantity is being measured by the voltmeter?

a)

volts

b)

electromotive force

c)

potential difference

d)

current

22.

Which physical quantity is being measured by the voltmeter?

a)

current

b)

potential difference

c)

resistance

d)

electromotive force

23.

Pd/voltage is the work done to drive a unit charge through a component.

Which is the correct formula?

a)

$voltage\ =\ work\ done\ \times ch\arg e$

b)

$voltage\ =\ \frac{work\ done}{ch\arg e}$

c)

$voltage=\frac{ch\arg e}{work\ done}$

24.

The e.m.f. of a dry cell is 1.5 V. What is the energy provided by the cell to drive 0.4 C of charge around the circuit?

a)

0.27 J

b)

0.60 J

c)

1.90 J

d)

3.75 J

25.

Resistance R is defined as the ratio of

a)

current to potential difference

b)

potential difference to current

c)

electric charge

d)

electric charges

26.

Resistance is the ratio of potential difference to current.

Which is the correct formula for resistance R?

a)

$R=VI$

b)

$R=\frac{V}{I}$

c)

$R=\frac{I}{V}$

27.

Which is the S.I. unit of resistance?

a)

$\rho$

b)

$\propto$

c)

$\Omega$

d)

$\lambda$

28.

A p.d. of 240 V is applied across a heating element, which drive a current of 8 A across it. What is its resistance?

a)

$0.0333\ \Omega$

b)

$30\ \Omega$

c)

$1920\ \Omega$

29.

Resistivity of a material is a property that determines its resistance (depending on length and cross-sectional area).

Which formula is correct?

a)

$R=\frac{\rho}{lA}$

b)

$R=\rho lA$

c)

$R=\frac{\rho l}{A}$

30.

If these materials were all made into wires of identical shapes and sizes, which would be the best electrical conductor?

a)

copper

b)

aluminium

c)

graphite

d)

silicon

31.

Which copper wire has the lowest resistance?

a)

1 metre of 1 mm diameter wire

b)

0.5 metre of 1 mm diameter wire

c)

0.5 metre of 0.5 mm diameter wire

d)

1 metere of 0.5 mm diameter wire

4E ScPhy: Current of Electricity

Total questions: 31

Worksheet time: 18mins

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